.container {
    width: 700px;
    margin: 40px auto;
    background: white;
    padding: 40px;

    /* SIDE BARS + BORDER */
    border-left: 3px solid black;
    border-right: 3px solid black;
    border-bottom: 3px solid black;
     border: 3px solid black;
}

.section{
    color:green;
}
.blue{
    color:blue;
}