body{
    margin-left: 60px;
    background-color: black;
}
div{
    margin: 20px;
    
    width: 43%;
    height: 260px;
    
    box-shadow: 2px 2px 15px white;
}
.c1{

    background-color: #0000FE;
    float: left;

    
}
.c2{

    background-color: #FE0000;
    float: left;

}
.c3{

    background-color: #FFFF01;
    clear: both;
    float: left;
    height: 260px;
    

}
.c4{

    background-color: #008001;
    float: left;

    

}
a{
    display: block;
    text-decoration: none;
    color: red;
    margin-left: 20px;
    
}
h1{
    text-align: center;
    margin: auto;
}
iframe{
    width: 560px;
    height: 260px;
}