body {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    /*background: url(Images/background50.jpg);*/
    background-size: cover;
    background-image: url('../Images/background50.jpg');
}

.box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    width: 400px;
    padding: 40px;
    background: rgba(0,0,0,.8);
    box-sizing: border-box;
    box-shadow: 0 15px 25px rgba(0,0,0,.5);
    border-radius: 10px;
}

    .box h2 {
        margin: 0;
        padding-bottom: 20px;
        color: #fff;
        text-align: center;
    }

    .box .inputBox {
        position: relative;
    }

        .box .inputBox .input {
            width: 100%;
            padding: 10px 0;
            font-size: 16px;
            color: #fff;
            letter-spacing: 1px;
            margin-bottom: 30px;
            border: none;
            border-bottom: 1px solid #fff;
            outline: none;
            background: transparent;
        }

        .box .inputBox label {
            position: absolute;
            top: 0;
            left: 0;
            padding: 10px 0;
            font-size: 16px;
            color: #fff;
            pointer-events: none;
            transition: .5s;
        }

        .box .inputBox input:focus ~ label,
        .box .inputBox input:valid ~ label {
            top: -18px;
            left: 0;
            color: #03a9f4;
            font-size: 12px;
        }

        .box input[type="submit"] {
            background: transparent;
            border: none;
            outline: none;
            color: #fff;
            background: #03a9f4;
            padding: 10px 20px;
            cursor: pointer;
            border-radius: 5px;
        }