sub.css

.box{
    border: 1px solid none;
    width: 100%;
    
}

.boxbar{
    border: 1px solid black;
    padding: 7px;
    background: black;
}

.boxbar address a{
    float: right;
    text-decoration: none;
    color:white;
}

.boxbar i{
    color:white;
    width: 30px;
}
.list{
    border-bottom-width: 900px;
    border-bottom: 1px solid darkgray;
    padding:12px; 
    float: right;
}

.list ul li{
    float: left;
    text-align: center;
    width: 70px;
    list-style-type: none;
}


.list ul li a{
    text-decoration: none; 
    color:white;

}

.list ul li a:hover{
    border-bottom: 4px solid brown;
    padding: 2px;
}

body{
    background: linear-gradient(rgba(0,0,0,0.65),rgba(0,0,0,0.65),rgba(0,0,0,0.38),rgba(0,0,0,0)),url(learn_1.jpg)no-repeat;
    background-size: cover;
    font-family: latha;
}

.signup{
    width: 200px;
    margin: 5px;
    position: absolute;
    left: 20%;
    top:10%;
    border: 1px solid black;
    padding: 40px;
    background: black;
    color:white;
    border-radius: 8px;
    opacity: 0.8;
    font-family: cairo,sans-serif;
}

.signup form input{
    
    padding: 9px;
    border: none;
    margin: 4px auto;
}

.signup h3{
    border-bottom: 1px solid darkgray;
    text-align: center;
    text-transform: uppercase;
    font-family: cairo, sans-serif;
    padding: 5px;
    text-shadow: 1px 1px 1px;
    font-weight: bold;
    padding-top: -30px auto;
    line-height: 30px;
    font-size: 20px;
}

.signup input[type="submit"]{
    color:white;
    background-color: steelblue;
    border-radius: 5px;
}