body {
    margin: 0;
    padding: 0;
    background: url(back.jpg)no-repeat center center fixed;
    webkit-background-size: cover;
    moz-background-size: cover;
    -o-background-size: cover;
    font-family: sans-serif;
}

.box {
    background: #f5f5f5;
    color: red;
    top: 50%;
    left: 30%;
    position: absolute;
    transform: translate(-50%, -50%);
    box-sizing: border-box;
    padding: 70px 30px;
}

.user {
    width: 100px;
    height: 100px;
    position: absolute;
    top: -50px;
    left: calc(50% - 50px);
}

h1 {
    margin: 0;
    padding: 0 0 20px;
    text-align: center;
    font-size: 22px;
    color: black;
}

p {
    color: #f49126;
    margin: 0;
    padding: 0;
    font-weight: bold;
}

input {
    width: 100%;
    margin-bottom: 10px;
}

input[type="text"],
input[type="password"],
input[type="email"] {
    border: none;
    border-bottom: 1px solid #fff;
    background: transparent;
    outline: none;
    height: 40px;
    color: #673ab7;
    font-size: 16px;
}

input[type="submit"] {
    border: none;
    outline: none;
    height: 40px;
    background: #2196f3;
    color: #fff;
    font-size: 18px;
    border-radius: 20px;
}

input[type="submit"]:hover {
    cursor: pointer;
    background: #0097a7;
}

a {
    text-decoration: none;
    font-size: 16px;
    line-height: 20px;
    color: #069818;
}

a:hover {
    color: red;
}