Hello,
Please try to add this code in Theme Options > Custom css:
.fixed-header .container {
margin-top: 20px;
margin-bottom: 20px;
}
.fixed-header-area.color-light .menu > li > a {
padding-left: 20px;
padding-right: 20px;
font-weight: 600;
font-size: 14px;
}
Regards