*{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    box-sizing: border-box;
}

body
{
    background-color: black;
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    display: flex;
    min-height: 100vh;
}

form
{
    margin: auto;
    width: 50%;
    max-width: 500px;
    background-color: rgba(255,255,255,.15);
    padding: 30px;
}

h2
{
    text-align: center;
    margin-bottom:  20px;
    color: rgba(0,0,0,3);
}

input
{
    display: block;
    padding: 10px;
    width: 100%;
    margin: 15px 0;
    font-size: 15px;
}

input[type="submit"]
{
    background: linear-gradient(goldenrod, darkgoldenrod);
}