*{
    margin:0;
    padding:0;
}
.pull-left{
    float:left;
}
.pull-right{
    float:right;
}
.background-img{
    background-size:cover;
    background-position:center;
    background-repeat: no-repeat;
}
.clear:before{
    content:'';
    display:block;
    clear:both;
}