how configure mobile menu list?

Hello

From help here some while ago I used the code below for the mobile menu. I would like to make the area taken up by the menu slightly less. How?!

Cheers

Geoff

/* next 2 blocks to get menu at top of page rather than at the bottom */

@media (min-width: 760px) {
.navigation-top {
position: absolute;
top: 0px;
width: 100%;
height: 70px;
opacity: 0.8;
}
}

@media (min-width: 760px) {

.custom-header {
position: relative;
padding-top: 70px;
}
}

/* puts menu icon at top of mobile page so that menu options list is visible */

@media screen and (max-width: 767px) {

.navigation-top,
#masthead .wrap {
position: static;
}

.site-branding,
.custom-header-media {
z-index: 0;
}

.main-navigation {
left: 15%; /* orig 10% */
position: absolute;
top: 0;
width: 80%;
z-index: 1;
}

.main-navigation ~ a {
display: inline-block;
margin-top: 10px;
}

html .colors-custom.navigation-top .menu-toggle,
html .navigation-top .menu-toggle {
background: white;
color: red;
float: right;
margin-top: 0.5em; /* orig 1em */
z-index: 1;
}

.menu-menu-1-container {
clear: both;
}

html .colors-custom .menu-toggle:focus,
html .menu-toggle:focus {
background: white;
outline-color: black;
}
}