Size of letters/ color of background

Make a child theme

and add font size in your style.css file

#menu .sf-menu li a {
    position: relative;
    display: block;
    color: #000;
    text-decoration: none;
    padding: 5px 10px 5px 10px;
    border-radius: 5px;
    font-size: 16px;
}

to change the color to blue

.footer-container {
    background: #0BABF9;
}

.footer-navi {
    background: #030138;
}

Those instrunction works:

#menu .sf-menu li a {
position: relative;
display: block;
color: #000;
text-decoration: none;
padding: 5px 10px 5px 10px;
border-radius: 5px;
font-size: 16px;
}

But Those not:

.footer-container {
background: #0BABF9;
}

.footer-navi {
background: #030138;
}

These instructions don’t change the color of my feet page .( how you can see in this link.
https://oi65.tinypic.com/jghce8.jpg

May be you can place !important paramenter with the css attribute value

like

.footer-container {
background: #0BABF9 !important;
}

.footer-navi {
background: #030138 !important;
}

and please let me know if it worked.