Adding Custom CSS to a single column module on page

HI ! css noob. I found a footer on codepen I wish to use on my site but when I embed directly it displays as the demo with the html and css tabs visible.

So i figured I would paste the HTML and then edit the CSS for that module alone… I am trying to use a CSS selector and apply the CSS i have in layout settings. It’s not working as I would like, it targets the whole page and even then the footer looks nowhere near as I would expect it to

Can I select a column module and edit the css in layout without selecting anything else?

Thanks a lot to anyone that may be able to help
ps i am using tesseract 2 theme.

——————————————–
* {
box-sizing: border-box;
}

html, body {
height: 100%;
}

body {
font: 11px “Open Sans”, sans-serif;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
margin: auto;
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-flex-flow: column nowrap;
-ms-flex-flow: column nowrap;
flex-flow: column nowrap;
-webkit-box-pack: justify;
-webkit-justify-content: space-between;
-ms-flex-pack: justify;
justify-content: space-between;
}

ul {
list-style: none;
}

a {
text-decoration: none;
}

.generic-anchor {
color: #8DB9ED;
}
.generic-anchor:visited {
color: #8DB9ED;
}
.generic-anchor:hover {
color: #ccc;
}

.flex-rw {
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-flex-flow: row wrap;
-ms-flex-flow: row wrap;
flex-flow: row wrap;
}

main {
-webkit-box-flex: 1;
-webkit-flex: 1 1 auto;
-ms-flex: 1 1 auto;
flex: 1 1 auto;
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-webkit-align-items: center;
-ms-flex-align: center;
align-items: center;
-webkit-box-pack: center;
-webkit-justify-content: center;
-ms-flex-pack: center;
justify-content: center;
font: 10em “Oswald”, sans-serif;
color: #9b9b9b;
line-height: 1;
}

footer {
background: #373737;
margin-top: auto;
width: 100%;
}

.footer-list-top {
width: 33.333%;
}

.footer-list-top > li {
text-align: center;
padding-bottom: 10px;
}

.footer-list-header {
padding: 10px 0 5px 0;
color: #fff;
font: 2.3vw “Oswald”, sans-serif;
}

.footer-list-anchor {
font: 1.3em “Open Sans”, sans-serif;
}

.footer-social-section {
width: 100%;
-webkit-box-align: center;
-webkit-align-items: center;
-ms-flex-align: center;
align-items: center;
-webkit-justify-content: space-around;
-ms-flex-pack: distribute;
justify-content: space-around;
position: relative;
margin-top: 5px;
}

.footer-social-section::after {
content: “”;
position: absolute;
z-index: 1;
top: 50%;
left: 10px;
border-top: 1px solid #ccc;
width: calc(100% – 20px);
}

.footer-social-overlap {
position: relative;
z-index: 2;
background: #373737;
padding: 0 20px;
}

.footer-social-connect {
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-webkit-align-items: center;
-ms-flex-align: center;
align-items: center;
font: 3.5em “Oswald”, sans-serif;
color: #fff;
}

.footer-social-small {
font-size: 0.6em;
padding: 0px 20px;
}

.footer-social-overlap > a {
font-size: 3em;
}

.footer-social-overlap > a:not(:first-child) {
margin-left: 0.38em;
}

.footer-bottom-section {
width: 100%;
padding: 10px;
border-top: 1px solid #ccc;
margin-top: 10px;
}

.footer-bottom-section > div:first-child {
margin-right: auto;
}

.footer-bottom-wrapper {
font-size: 1.5em;
color: #fff;
}

.footer-address {
display: inline;
font-style: normal;
}

@media only screen and (max-width: 768px) {
.footer-list-header {
font-size: 2em;
}

.footer-list-anchor {
font-size: 1.1em;
}

.footer-social-connect {
font-size: 2.5em;
}

.footer-social-overlap > a {
font-size: 2.24em;
}

.footer-bottom-wrapper {
font-size: 1.3em;
}
}
@media only screen and (max-width: 568px) {
main {
font-size: 5em;
}

.footer-list-top {
width: 100%;
}

.footer-list-header {
font-size: 3em;
}

.footer-list-anchor {
font-size: 1.5em;
}

.footer-social-section {
-webkit-box-pack: center;
-webkit-justify-content: center;
-ms-flex-pack: center;
justify-content: center;
}

.footer-social-section::after {
top: 25%;
}

.footer-social-connect {
margin-bottom: 10px;
padding: 0 10px;
}

.footer-social-overlap {
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-box-pack: center;
-webkit-justify-content: center;
-ms-flex-pack: center;
justify-content: center;
}

.footer-social-icons-wrapper {
width: 100%;
padding: 0;
}

.footer-social-overlap > a:not(:first-child) {
margin-left: 20px;
}

.footer-bottom-section {
padding: 0 5px 10px 5px;
}

.footer-bottom-wrapper {
text-align: center;
width: 100%;
margin-top: 10px;
}
}
@media only screen and (max-width: 480px) {
.footer-social-overlap > a {
margin: auto;
}

.footer-social-overlap > a:not(:first-child) {
margin-left: 0;
}

.footer-bottom-rights {
display: block;
}
}
@media only screen and (max-width: 320px) {
.footer-list-header {
font-size: 2.2em;
}

.footer-list-anchor {
font-size: 1.2em;
}

.footer-social-connect {
font-size: 2.4em;
}

.footer-social-overlap > a {
font-size: 2.24em;
}

.footer-bottom-wrapper {
font-size: 1.3em;
}
}

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