style.css

body {
    margin: 0;
    background: url('../img/background.jpg');
    background-size: auto;
    background-repeat: no-repeat;
}

.fixed-bottom{
    bottom: 10%;
}

.btn-lg{
    font-family: "Droid Sans", sans-serif;
    font-weight: bold;
    font-size: 20px;
    color: grey;
    position: relative;
    margin-left: 65px;
    width: 20%;
    padding: 1% 0;
}

.box-popup{
    top:70%;
    left:75%;
    outline: none;
    overflow:hidden;
    height:30%;
    width:20%;
    background-color:#f8f8f8;
    bottom: 0px;
    position:absolute;
}