body {
    font-family:Arial;
    font-size:18px;
    background-image:url("mountain.jpeg");
    color:white;
    
}

.centered {
    text-align:center;
}

header {
    background-color:rgba(10, 164, 247, 1);
    padding: 10px 10px 20px 10px;
    margin: -10px;
}

main {
    left:0px;
    position: absolute;
}

main > div {
    padding-left:10px;
    padding-right:10px;
    padding-bottom:10px;
    margin-bottom:10px;
    margin-left:10px;
    margin-top:10px;
    background-color:rgba(10, 164, 247, 0.5);
}

aside {
    width:600px;
    height:200px;
    right:0px;
    position: absolute;
}

aside > div {
    margin-right:10px;
    margin-top:10px;
    background-color:rgba(10, 164, 247, 0.5);
    padding-bottom:10px;
}