#one{
    background-color: #F2F2C4;
    border-color: #F2F2C4;
}

#ja{}

#je{}

#ji{height: 400px;
                width: 100%;
                background: black;
            margin: 20px; 
           color: white;
        }

#ju{height: 400px;
                width: 100%;
                background: url(../imagenes/3.jpg);
            position: relative;
        }