.box{
    height: 150px;
    width: 150px;
    border: 2px solid black;
    
 }

.b1{
    background-color: white;
    float: left;
    font-size: 30px;
    padding: 45px;
}

.b2{
    background-color: green;
    float: left;
    font-size: 30px;
    padding: 45px;
} 



.clear{
    clear: both;
}