body{
    margin: 2px;
    padding: 2px;
    font-size: 14px;
    font-family: sans-serif;
    background-color: white;
    text-align: center;
}


header, footer{
    padding-top: 5px;
   width: 750px;
   background-color: aqua; 
   clear: both;
}
section{
    background-color: orange;
    height: 60px;
    width: 468px;
    margin-left: 150px;
    margin-right: auto;
}

nav{
    background-color: blueviolet;
    width: 175px;
    float: left;
    margin: 2px ;
    padding: 2px;
}
article{
    background-color: brown;
    float: left;
    width: 400px;
    padding: 2px;
}
aside{
    background-color: violet;
    width: 175px;
    float: left;
    margin: 2px;
    margin-right: auto;
    padding: 2px;
}
.obal{
    padding-top: 5px;
    border-radius: 1px;
    border-color: black;
    padding-left: auto;
    padding-right: auto;
}