.bigbox{
    width: 100%;
    border: 2px solid yellowgreen;
    padding: 1em 1em 0 1em;
}
.box{
    width: 32%;
    height: 150px;
    background-color: yellowgreen;
    margin: 0 2% 2% 0;
    overflow:auto;
}
.floatleft{
    float: left;
}
.clearfix:after {
    content: ".";
    clear: both;
    display: block;
    visibility: hidden;
    height: 0px;
}