i.fa.fa-facebook{
 box-sizing: border-box; 
 font-size: 18px;
 height: 30px;
 width: 30px ;
 line-height: 30px ;
 text-align: center ;
 }
 i.fa.fa-facebook {
 border: 1px solid #3B5998 ;
color: #fff ;
 background: #0274be ;
 }
  
 i.fa.fa-facebook:hover{
 opacity: .6;
}