Please help! Reduce space between blog posts on index page

I desperately need to reduce the amount of space between by blog posts on the index page. See example here: Must Have Boxes. I’ve tried so many ways to fix it but I’m not sure why I’m having issues. Any help is greatly appreciated!

Here’s my style sheet:

/*
Theme Name: neni
Theme URI: https://www.pixxels.at/wordpress-theme-neni/
Description: neni is a clean and minimal two-column blog theme by pixxels.at. A responsive layout optimizes the theme for mobile devices. To customize the theme you can choose your own color and background.

Author: Marion Lindert
Author URI: https://www.pixxels.at
Version: 1.1.6

Tags: orange, light, custom-colors, custom-background, two-columns, right-sidebar, threaded-comments, custom-menu, sticky-post, full-width-template, custom-header, featured-images, theme-options, translation-ready, editor-style

License: GNU/GPL Version 2 or later
License URI: https://www.gnu.org/licenses/gpl.html
*/

/* Reset
——————————————— */
/* https://meyerweb.com/eric/tools/css/reset/
v2.0 | 20110126
License: none (public domain)
*/
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote,
a, img, strong, var,
b, u, i, center, dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}

/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
display: block;
}
ol, ul {
list-style: none;
}
blockquote:before, blockquote:after {
content: ”;
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}

/** — GENERAL STRUCTURE — **/

body {
background-color:#fff;
font-family: georgia;
color: #333;
font-size: 0.9em;
}
#page {
max-width: 960px;
background-color:#fff;
font family:georgia;
z-index: 0;
margin: 0 auto 1em auto;
padding: 1em 1em;
}
#branding {
border-top: 4px solid #EC5F00;
}
#main {
width: 100%;
float: left;
overflow: hidden;
}
#wrapper {
margin:0.5em 0 0;
padding:2em 0;
overflow: hidden;
}
#content {
width: 65.0%;
float: left;
margin-right:2em;
}
#secondary {
width: 30.0%;
float: right;
overflow:hidden;
}
#colophon {
width: 100%;
float: left;
padding:1em 0 0;
overflow: hidden;
font-size: 0.8em;
border-top: 4px solid #EC5F00;
}
.aligncenter, div.aligncenter {
margin-left: auto;
margin-right: auto;
display: block;
}
.alignleft {
float: left;
}
.alignright {
float: right;
}
img {
max-width: 100%;
height: auto;
}
body.no-sidebar #content {
width: 100%;
}

/** — STYLES — **/
#content h1 {
font: bold 1.4em/1.4 serif;
padding: 0 0 0.6em;
color:#333;
}
#content h2 {
font: bold 1.3em/1.3 serif;
padding: 1.5em 0 0.6em;
color:#333;
}
#content h3 {
font: bold 1.2em/1.4 serif;
padding: 1.2em 0 0.3em;
color:#333333;
}
#content h4 {
font: bold 1.1em/1.4 sans-serif;
padding: 1.2em 0 0.3em;
color: #333;
}
#content h5 {
font: bold 1em/1.3 sans-serif;
padding: 1em 0 0.2em;
}
#content h6 {
font: bold .9em/1.3 sans-serif;
padding: 0.9em 0 0.1em;
}
p {
line-height: 1.2;
padding-bottom: 1.2em;
}
strong {
font-weight:bold;
}
blockquote {
margin: 1em 0em;
padding: 0.5em 1em 0.2em;
border-left: 0.5em solid #EC5F00;
background-color: #EEE;
font: normal 1.1em serif;
}
#content address {
padding: 0 0 2em 0;
font-style: italic;
}
#content abbr, acronym {
border-bottom: .1em dotted;
}
#content pre, code, tt, kbd {
font-size: 1.1em;
}
#content img {
max-width:100%;
height: auto;
margin: 0;
padding: 0;
}
#content img.aligncenter {
margin: 1em auto;
}
#content img.alignleft ,#content .wp-caption.alignleft {
margin: 1em 1em 0 0;
}
#content img.alignright,#content .wp-caption.alignright {
margin: 1em 0 0 2em;
}
#content img.alignnone {
margin: 0;
}
img.attachment-thumbnail, img.wp-post-image, img.attachment-medium, img.attachment-large, img.attachment-full{
float: left;
margin-right:1em !important;
margin-bottom:0.5em!important;
}
#content .wp-caption.alignnone {
margin: 0 0 1em;
}
#content .wp-caption {
max-width: 100%;
}
#content p.wp-caption-text, .entry-caption p {
font-size:0.8em;
}
#content object, #content embed, #content iframe {
max-width: 100%;
display: block;
}
#content table {
margin:1em 0em 3em 0em;
}
#content table tr {
border-bottom:1px solid #EEE;
}
#content table tr th {
padding: 1em 2em 1em 2em;
border-top:1px solid #EEE;
border-left:1px solid #EEE;
border-right:1px solid #EEE;
}
#content table tr td {
padding: 1em 2em 1em 2em;
border-left:1px solid #EEE;
border-right:1px solid #EEE;
}
/** — Links — **/
a, a:link, a:visited {
color: #EC5F00;
text-decoration: none;
}
a:hover, a:active {
color: #333;
text-decoration: underline;
}

/** — Navigations — **/
#branding #main-menu {
margin-right: 0em;
margin-top: 0.9em;
max-width: 70%;
float:right;
word-wrap: break-word;
font: bold 1.1em/1.1;
}

#branding #main-menu ul li {
float: left;
list-style: none;
position: relative;
}
#branding #main-menu ul li a {
display: block;
font-size: 1.1em;
color:#FFF!important;
font family:georgia;
background-color:#EC5F00;
margin-left: 0.5em;
margin-bottom: 0.8em;
padding: 0.3em;
}
#branding #main-menu ul li:first-child a {
margin-left: 0em;
}
#branding #main-menu ul li ul li:first-child a {
margin-left: 0.3em;
}
#branding #main-menu ul li a:hover {
color:#FFF!important;
background-color:#444!important;
text-decoration: none;
}
#branding #main-menu ul ul {
display: none;
float: left;
position: absolute;
top: 3em;
left: 0.3em;
z-index: 500;
background-color:#EC5F00;
}
#branding #main-menu ul ul ul {
left: 100%;
top: 0;
}
#branding #main-menu ul ul li a, #branding #main-menu ul ul ul li a {
font-size: 0.9em;
color:#000!important;
background-color:#FFF!important;
width: 9em;
height: auto;
text-transform: none;
padding:0.2em 0.2em 0.2em 0.5em;
border: none;
margin: 0.2em 0 0.3em 0.2em;
}
#branding #main-menu ul li:hover > ul {
display: block;
}
#branding #main-menu ul ul a:hover, #branding #main-menu ul ul ul a:hover {
color:#EC5F00!important;
background-color: #EEE!important;
}

/** — Lists — **/

#content .post ul, #content .page ul, .comment-body ul {
padding:0.5em 0 0.5em 2em;
line-height: 1.3;
}
#content .post ul li, #content .page ul li, .comment-body ul li {
padding:0;
list-style: disc!important;
}
#content .post ol, #content .page ol, .comment-body ol {
padding:0.5em 0 0.5em 2em ;
line-height: 1.3;
}
#content .post ol li, #content .page ol li, .comment-body ol li {
padding:0;
list-style: decimal!important;
}
#content .post ol ol li, #content .page ol ol li, .comment-body ol ol li {
list-style: lower-latin!important;
}
#content .post ol ol ol li, #content .page ol ol ol li, .comment-body ol ol ol li {
list-style: decimal!important;
}
#content dl {
margin:0 ;
padding: 0;
}
#content dt {
font-weight: bold;
margin: 0;
padding-top: 1em;
}
#content dd {
margin: 0;
padding-bottom: 1em;
padding-left: 3em;
}

/** — HEADER — **/

/** — Blog-Title — **/

#blog-title {
padding: 1em 0 0em;
}
#site-title{
margin: 0 0em 0 0;
font-size: 4em;
line-height:1.2;
font-weight: bold;
}

#site-title a:hover {
text-decoration:none;
color:#333!important;
}
#site-description {
font:italic 1em Times, serif;
color: #777;
margin: 0em 0 0 0;
}

/** — Article-Headers — **/

.entry-header {
padding-bottom: 0.6em; font-family:georgia
}
.entry-header h1, .entry-header h1 a, .entry-header h1 a:link, .entry-header h1 a:visited {
font: bold 1.1em/1.1 sans-serif; font-family:georgia;
color:#333;
}
.entry-header h1 a:hover, .entry-header h1 a:active {
text-decoration:underline;
}
.entry-header p {
font-size: 0.8em;
}

/** — POSTS — **/
#content .post {
overflow: hidden;
clear: both;
padding-bottom: 1em;

}
#content .entry-meta p {
padding: 1em 0 0;
font-size: 0.8em; font family:georgia;
}
#content .entry-meta a, #content .entry-meta a:link, #content .entry-meta a:visited {
text-decoration:none;
}
#content .entry-meta a:hover, #content .entry-meta a:active {
text-decoration:underline;
}
#content .sticky {
}

.more-link {
font-weight:bold;
}
#comments .bypostauthor {
}

/** — CLEARING FLOATS — **/
.clear {
clear:both;
display:block;
overflow:hidden;
visibility:hidden;
width:0;
height:0;
}
.clearfix:after {
clear:both;
content:’ ‘;
display:block;
visibility:hidden;
width:0;
height:0
}
.page-link {
clear:both;
}

/** — Fullwidth Page — **/
#content.full-width {
width:100%!important;
}

/** — SIDEBAR — **/
aside.widget {
font-size: 0.9em;
padding-top: 0.5em;
padding-bottom: 2em;
word-wrap: break-word;
}
aside.widget ul{
background-color: #fff;
}
aside.widget ul li {
padding: 0.3em 0 0.3em;
margin-left: 1em;
}
.widget h3.widget-title {
color: #EC5F00;
text-transform: uppercase;
font: bold 1.1em/1.4 sans-serif;
font-family: georgia;
margin-right: 0.5em;
text-align: left;
}
.widget a, .widget a:link, .widget a:visited {
color: #333!important;
text-decoration:none;
}
.widget a:hover, .widget a:active {
color: #EC5F00!important;
text-decoration:none;
}

/**– nav below, image navigation –**/
#content #nav-below .nav-previous, #nav-below .nav-next {
float:left;
}
#image-navigation .previous-image, #image-navigation .next-image {
float:right;
}
#content #nav-below .nav-previous a, #content #nav-below .nav-next a, #image-navigation .previous-image a, #image-navigation .next-image a {
margin:0;
display:block;
font:italic 1.4em Times, serif;
font-weight:bold;
margin-top:1em;
}
#content #nav-below .nav-previous a, #image-navigation .previous-image a{
padding-right: 1em;
}

.page-link a{
margin:0 0.3em;
padding:0.2em 0.3em;
background:#EEE;
}

/** — Search — **/

.search {
padding: 0.3em 0 2em;
}
#search_form {
width: 100%;
margin: 0;
padding: 0;
float: left;
overflow: hidden;
}
#search_form #search_input {
width: 55%;
background-color:#EEE;
padding: 0.4em 1em 0.4em 0;
border: none;
font-size: 1em;
font-family: Georgia;
border: 1px solid #CCC;
}
#search_form .search_input:hover, #search_form .search_input:focus, #search_form .search_input:active {
background-color:#FFF;
}
#search_submit {
margin: 0;
width:35%;
float:right;
padding: 0.4em 1em 0.4em;
display: inline;
background-color: #DFDFDF;
border: none;
font-size: 1em;
font-family: Georgia;
font-weight:bold;
color: #EC5F00;
text-align: center;
text-transform: uppercase;
}
#search_submit:hover {
color: #FFF!important;
background-color: #EC5F00;
}
.widget_calendar #calendar_wrap {
background-color: #EEE;
padding: 0.3em 0em 0.3em 1em;
}
.widget_calendar #wp-calendar caption {
font-style: italic;
text-align: left;
margin-bottom: 0.5em;
}
.widget_calendar table#wp-calendar th, .widget_calendar table#wp-calendar td {
padding: 0 0.5em 0.5em 0;
}
.widget_calendar table#wp-calendar tbody tr td#today {
font-style: italic;
}
.widget_calendar table#wp-calendar tbody tr td a{
font-weight: bold;
}

.tagcloud {
background-color: #EEE;
padding: 0.3em 0em 0.3em 1em;
}

/** — GALLERY — **/
#content .gallery {
margin:auto;
}

#content .gallery-item {
float: left;
text-align: left;
width: 29%;
vertical-align: top;
overflow: hidden;
margin-right:0.5em;
}
#content .gallery-caption {
font-size:0.8em;
margin:0;
padding-right:3em;
padding-left:0;
}

/** — COMMENTS — **/
#comments {
background-color:#FFF;
margin-top:3em;
border-top: 4px solid #EEE;
}
#comments .comment-meta {
font-size: 0.8em;
font-family: Georgia;
margin-bottom:1em;
}
#comments .comment-awaiting-moderation {
color: #E00;
}
#comments ol.commentlist {
font-size:1em;
font-family: Georgia;
}
.reply {
margin-bottom:2em;
}
.reply a, .reply a:link, .reply a:visited {
background: #DFDFDF;
padding: 0.3em 0.5em;
text-transform:uppercase;
font-size:0.9em;
font-weight:bold;
font-family:Georgia;
}
.reply a:hover, .reply a:focus, .reply a:active {
background: #EC5F00;
color:#FFF!important;
text-decoration:none;
font-family:georgia;
}
#comments li{
list-style:none;
}

#content #comments ol li ul.children {
padding:0em;
}
#content #comments ol li.depth-1 {
padding:0em;
}
#content #comments ol li.depth-2, #content #comments ol li.depth-3, #content #comments ol li.depth-4, #content #comments ol li.depth-5 {
margin:0 0 0em 2em;
padding:0em;
border-bottom:none;
}

#comments #comment-nav-above, #comments #comment-nav-below {
margin-bottom:1em;
}

#comments .nav-previous a, #comments .nav-next a {
font:italic 1.4em Georgia;
font-weight:bold;

}

/** — comment reply — **/

#comments #respond {
background: #EEE;
padding-top: 1em;
padding-right: 3em;
padding-bottom: 1em;
padding-left: 1em;
}
#content #comments #respond h3#reply-title {
margin:0;
padding:0;
font-size: 1.4em;
font-family: georgia;
}
#commentform {
font-size: 0.9em;
}
form#commentform p.comment-form-author, form#commentform p.comment-form-email, form#commentform p.comment-form-url, form#commentform p.comment-form-comment {
padding:1.5em 0 0;
}
input#submit {
background-color:#DFDFDF;
padding: 0.5em 0.5em;
color:#EC5F00;
margin: 0;
border: none;
text-align: center;
text-transform: uppercase;
font-size: 1em;
font-weight:bold;
font-family:Georgia;
}
input#submit:hover {
background-color:#EC5F00;
color:#FFF!important;
}
form#commentform input#author, form#commentform input#email, form#commentform input#url {
margin: 0;
padding: 0.5em;
display: block;
font-size:1em;
font-family:Georgia;
color:#444;
}
form#commentform textarea#comment {
margin: 0.5em 0 0;
padding: 0.5em;
display: block;
font-family:Georgia;
font-size: 1em;
width:30em;
}

/** — FOOTER — **/
a.top {
margin: 0.5em 0;
font-weight: bold;
display: block;
}

/** — CSS3 MEDIA QUERIES FOR RESPONSIVE DESIGN — **/

@media screen and (max-width : 1200px) {
#branding #main-menu {right: 0; margin-top: 0.6em; max-width: 100%; position:relative; float:left;}
}

@media screen and (max-width : 800px) {
#main { margin: 0;}
#header { padding:0;}
#page { max-width: 100%; margin: 0 auto; padding: 0 0em; }
body.no-sidebar #content, #content { width: 100%; }
#secondary { width: 100%; float:left; margin-left:0; margin-top:3em;}
aside.widget { font-size: 1em; padding-bottom:2em; padding-top:2em; border-top: 4px solid #EEE; }
aside.widget ul{ background-color: #FFF; }
aside.widget ul li { padding: 0; margin:0 2em 0 0; list-style: none; display:inline; line-height:2;}
aside.widget ul li ul { display:inline; margin:0 0 0 2em; }
aside.widget li.menu-item ul.sub-menu li.menu-item:last-child{ margin:0; }
.widget h3.widget-title {color: #EC5F00; text-transform: none; font: bold 1.5em/1.4 sans-serif; text-align: left; }
.widget a, .widget a:link, .widget a:visited { color: #EC5F00; text-decoration:underline; }
.widget a:hover, .widget a:active { color: #333; text-decoration: underline; }
.widget ul li ul a, .widget ul li ul a:link, .widget ul li ul a:visited {color: #999!important; text-decoration:underline; }
.widget ul li ul a:hover, .widget ul li ul a:active { color: #333!important; text-decoration: underline; }
#content #nav-below {border-top: 4px solid #EEE; padding-top:1em;}
}

@media screen and (max-width : 480px) {
#branding { border:none; #EC5F00}
#branding #main-menu {float:none; margin:0; padding:0;}
#branding #main-menu ul {margin:0; padding:0; }
#branding #main-menu ul li, #branding #main-menu ul li ul li {list-style-type:none; padding:0; margin:0; display:inline; float:none;}
#branding #main-menu ul ul, #branding #main-menu ul ul ul {display:inline; float:none; margin:0 ; position:relative; top:0; padding:0; left:0;}
#branding #main-menu ul li a {font-size: 0.9em;color:#FFF;background-color:#EC5F00;float:none;margin:0; margin-bottom:0.2em; margin-top:0.5em;}
#branding #main-menu ul li:first-child a {margin:0;}
#branding #main-menu ul ul li{padding-left:15em;}
#branding #main-menu ul li a:hover {color:#FFF; background-color:#444;text-decoration: none;}
#branding #main-menu ul ul li a, #branding #main-menu ul ul ul li a {font-size: 0.8em;color:#000; background-color:#FFF; display:inline; padding:0; margin:0; margin-left:1em; line-height:1.5; text-decoration:underline;}
#branding #main-menu ul ul li a:hover, #branding #main-menu ul ul ul li a:hover {color:#EC5F00!important; background-color:#FFF!important;text-decoration:underline; }
#branding #main-menu ul li:hover > ul {display: inline;}
#blog-title {padding: 1em 0 0.5em; text-align:right;}
#site-title {font-size:2.5em; margin: 0 0.5em 0 0; line-height:1; text-align:right;}
#site-description {font-size:0.8em; text-align:right;}
.entry-header {padding-bottom: 0;}
.entry-header h1, .entry-header h1 a, .entry-header h1 a:link, .entry-header h1 a:visited {line-height:1; font-size:1.2em; padding: 0;}
#wrapper {margin:0.5em 0 0; padding: 0; }
}

.post .entry, .pages .entry { line-height: 24px; }