body {
    margin: 0;
    padding: 0;
    background: url(Alterno.jpg);
    background-size: cover;
    background-position: center;
    font-family: sans-serif;
}

.login-box {
    width: 320px;
    height: 500px;
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    top: 40%;
    left: 50%;
    position: absolute;
    transform: translate(-50%,-50%);
    box-sizing: border-box;
    padding: 70px 30px;
}

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

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

.login-box p {
    margin: 0;
    padding: 0;
    font-weight: bold;
}

.login-box input {
    width: 100%;
    margin-bottom: 20px;
}

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

    .login-box input[type="submit"] {
        border: none;
        outline: none;
        height: 40px;
        background: #1c8adb;
        color: #fff;
        font-size: 18px;
        border-radius: 20px;
    }

        .login-box input[type="submit"]:hover {
            cursor: pointer;
            background: #39dc79;
            color: #000;
        }

.login-box a {
    text-decoration: none;
    font-size: 14px;
    color: #fff;
}

    .login-box a:hover {
        color: #39dc79;
    }