body{
    margin:0;
    padding:0;
}

div{
    width: 20%;
    height: 20%;
    background-color: cornflowerblue;
    margin-right: 10px;
    left : 300px;
    top : 450px;
    position: relative;
}

.bloc1 {
    background-color: aquamarine;
    position: absolute;
    height: 400px;
    width: 400px;
    top : 50px;
    left : 70px;
}

.bloc2{
    background-color: antiquewhite;
    position : fixed;
    width: 300px;
    height: 300px;
    top : 100px; 
    left : 500px;
} 

.bloc3{
    height: 700px;
    width: 700px;
    border: 2px solid #000000;
    background-color: blue;
    position: absolute;
    top: 500px;
    left : 300px;
}

.bloc4{
    width: : 400px;
    height: 400px;
    background-color: white;
    border : 15px solid #0000FF;
    position: fixed;
    top: 300px;
    left : 200px;
}