*{
    box-sizing: border-box;
}
.row::after{
    content: "";
    clear: both;
    display: table;
}
[class*="col-"]{
    float: left;
    padding: 15px;
}
/* For mobile phones: */
[class*="col-"] {
    width: 100%;
}
@media only screen and (min-width: 600px) {
    /* For tablets: */
    .col-s-1 {width: 8.33%;}
    .col-s-2 {width: 16.66%;}
    .col-s-3 {width: 25%;}
    .col-s-4 {width: 33.33%;}
    .col-s-5 {width: 41.66%;}
    .col-s-6 {width: 50%;}
    .col-s-7 {width: 58.33%;}
    .col-s-8 {width: 66.66%;}
    .col-s-9 {width: 75%;}
    .col-s-10 {width: 83.33%;}
    .col-s-11 {width: 91.66%;}
    .col-s-12 {width: 100%;}
}
@media only screen and (min-width: 768px) {
    /* For desktop: */
    .col-1 {width: 8.33%;}
    .col-2 {width: 16.66%;}
    .col-3 {width: 25%;}
    .col-4 {width: 33.33%;}
    .col-5 {width: 41.66%;}
    .col-6 {width: 50%;}
    .col-7 {width: 58.33%;}
    .col-8 {width: 66.66%;}
    .col-9 {width: 75%;}
    .col-10 {width: 83.33%;}
    .col-11 {width: 91.66%;}
    .col-12 {width: 100%;}
}
html{
    font-family: "Lucida Sans", sans-serif;
}
.header{
    background-color: darkslateblue;
    color: azure;
    padding: 15px;
}
.leftmenu{
    background-color: lightsteelblue;
}
.leftmenu ul{
    list-style-type: none;
    margin: 0;
    padding: 0;
}
.leftmenu li{
    padding: 8px;
    margin-bottom: 7px;
    background-color: burlywood;
    color: cornsilk;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}
.leftmenu li:hover{
    background-color: darkcyan;
}
.main-wrapper div{
    width: 100%;
    height: auto;
    background-color: black;
}
.main-wrapper{
    background-color: lightgray;
}
.rightmenu{
    background-color: lightsteelblue;
    padding: 15px;
    color: aliceblue;
    text-align: center;
    font-size: 14px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}
.footer{
    background-color: midnightblue;
    color: lightgreen;
    text-align: center;
    font-size: 12px;
    padding: 15px;
}