section{
    border: 2px solid black;
    background-color: pink;
    margin:10px;
}
h1{
    color:red;
}
section > div{
    background-color: aliceblue;
    display:flex;
    justify-content: flex-start;
    margin:10px;
    position: relative;
    align-items: center;
    
    height: 150px; 
}
section >div >div{
    background-color: blue;
    width: 20px;
    height: 20px;
    margin:10px;
}
#center{
    justify-content:center;
}
#right{
    justify-content: flex-end;
}
.absolute{
    position: absolute; 
    z-index: 1;
    width:50px;
    height: 40px;
    
}
p{z-index: 2;}
.fixed{
    position: fixed;
    top: 10px;
    right: 0px;
    margin:0px;
    width:4px;
    height:calc(100% - 20px)
}

@media screen and (max-width:490px) {

    body {
        background-color: red;
    }
    
}