li{
    display: inline;
}
ul{
    border: black 1px solid;
    margin-right: 1500px;
    padding-bottom: 20px;
}
a{
    font-size: 0px;
}
a[href*="HTML"]{
    display:inline-block;
    width: 100px;
    height: 100px;
    font-size: 0px;
    background-image:url("html5-plain.svg");
}
a[href*="CSS"]{
    display:inline-block;
    width: 100px;
    height: 100px;
    font-size: 0px;
    background-image:url("css3-plain.svg");
}
a[href*="Javas"]{
    display:inline-block;
    width: 100px;
    height: 100px;
    font-size: 0px;
    background-image:url("javascript-plain.svg");
}