/* plus petit que 768*/
@media only screen
and (max-width : 640px) {
    .center{
        width:92%;
        padding-left:4%;
        padding-right:4%;
    }
    
    #logo{  
        margin: 20px 0 0 !important;
        width: 100%;
    }
    
    #line_2 label,
    #line_3 label,
    #line_4 label,
    #line_5 label{
        width: 80%;
    }
    
    #line_2 input,
    #line_3 input,
    #line_4 input,
    #line_5 input{
        width: 15%;
        margin: 5px 0;
        padding: 0;
    }
    
    #line_1 input[type=text]{
        width: 96%;
        padding: 5px 2%;
    }
    
    #line_1 .left{
        width: 100%;
        float: none;
    }
    
    #line_1 .right{
        width: 100%;
        float: none;
    }

}

@media only screen
and (max-width : 320px) {
   
}