*{
    box-sizing: border-box;
}
body{
    background-color: lightgrey;
    padding: 20px;
}
.main{
    max-width: 1000px;
    margin: auto;
}
h1{
    font-size: 50px;
    word-break: break-all;
}
.row{
    margin: 8px -16px;
}
.row,
.row > .column{
    padding: 8px;
}
.column{
    float: left;
    width:25%;
}
.row:after{
    content:"";
    display: table;
    clear: both;
}
.content{
    background-color: white;
    padding: 10px;
}
@media screen and (max-width: 900px){
    .column{
        width: 50%;
    }
}
@media screen and (max-width:600px){
    .column{
        width: 100%;
    }
}