body {
    background: url(../img/wallpaper2.jpg);
    background-size: cover;
	background-repeat: no-repeat;
	background-color: black;
}

h1 {
    font-size: 26px;
}

header img {
	margin-bottom: 20px;
}

.col-centered {
    float: none;
    margin: 0 auto;
    text-align: center;
}

input[type="submit"] {
    width: 100%;
    cursor: pointer;
}