*{
    padding: 0px;
    margin: 0px;
}

body{
    background: lightgrey;
    font-family: Arial, Helvetica, sans-serif;
}
#container{
    width: 100%;
    margin: 0px auto;
}

header{
    background: rgba(255, 72, 0, 0.795);
    height: 80px;
    text-align: center;
    line-height: 80px;
    color: white;
    margin: 10px;
}
#content{
    float: right;
    width: calc(85% - 40px);
    height: calc(750px - 20px);
    background: rgb(128, 58, 0);
    margin-left: 10px;
    margin-right: 10px;
    padding: 10px;
}

nav{
    float: left;
    width: calc(15% - 50px);
    text-align: center;
    height: calc(750px - 40px);
    background: rgb(255, 0, 0);
    margin-left: 10px;
    padding: 20px;
}
.center{
    display: flex;
    justify-content: center;
    align-items: center;
}