body  {
    background-color: #2F2F2F;
    color: #fff;
}

body *{
    font-family: Arial, Helvetica, sans-serif;
}
/* #2F2F2F */

.mb-10{
    margin-bottom: 10px;
}
.mb-20{
    margin-bottom: 20px;
}
.mb-30{
    margin-bottom: 30px;
}
.mt-10{
    margin-top: 10px;
}
.mt-20{
    margin-top: 20px;
}
.mt-30{
    margin-top: 30px;
    float: left;
}
.fl{
    float: left;
}
.fr{
    float: right;
}

.header{
    height:60px;
    width:100%;
    background: white;
}