html{
    height : 100%;
}
.gradient {
    height: 100%;
    margin: 0;
    padding:0;
    font-family: sans-serif;
    background-repeat: no-repeat;
    background-attachment: fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    background: rgb(2,0,36);
    background-repeat:no-repeat;
    background: -webkit-linear-gradient( 180deg, rgba(2,0,36,1) 0%, rgba(88,105,185,1) 43%, rgba(0,212,255,1) 100%);
    background: -moz-linear-gradient( 180deg, rgba(2,0,36,1) 0%, rgba(88,105,185,1) 43%, rgba(0,212,255,1) 100%);
    background: -ms-linear-gradient( 180deg, rgba(2,0,36,1) 0%, rgba(88,105,185,1) 43%, rgba(0,212,255,1) 100%);
    background: -o-linear-gradient( 180deg, rgba(2,0,36,1) 0%, rgba(88,105,185,1) 43%, rgba(0,212,255,1) 100%);
    background: linear-gradient(180deg, rgba(2,0,36,1) 0%, rgba(88,105,185,1) 43%, rgba(0,212,255,1) 100%);
}
.box{
    width: 300px;
    padding: 40px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    background: #191919;
    text-align: center;
    border-radius: 6px;
}
.box h1{
    color: white;
    text-transform: uppercase;
}
.box input[type = text]{
    border: 0;
    background: none;
    display:block;
    margin: 20px auto;
    text-align: center;
    border: 2px solid #3498db;
    padding: 14px 10px;
    width: 200px;
    outline: none;
    color: white;
    border-radius: 24px;
    transition: 0.25s;
}

.box input[type = text]:focus{
    width: 280px;
    border-color: #2ecc71;
}

.box input[type = "submit"]{
     border: 0;
    background: none;
    display:block;
    margin: 20px auto;
    text-align: center;
    border: 2px solid #2ecc71;
    padding: 14px 40px;
    outline: none;
    color: white;
    border-radius: 24px;
    transition: 0.25s;
    cursor: pointer;
}

.box input[type = "submit"]:hover{
    background: #2ecc71;
}