body {
     
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-image: url('background2.jpg');
    background-size: cover;
}

#matrix {
    margin: 0 auto;
	font-size: 18px;
}

.bg-matrix {
    background-color: #eaeef1!important;
}

input[type="submit"] {
    margin: 0 auto;
}