body {
    margin: 0;
    text-align: center;
    background-color: black;
    cursor: crosshair;
}
canvas {
    display: block;
    width: 100%;
    height: 100%;
}
.header {
    /*top:45%;*/
    top: 45%;
    color: #dddddd;
}
.footer {
    bottom: 3%;
}
.description {
    color: gray;
    padding-top: 50px;
}
.btn {
    border-radius: 30px;
    padding: 10px 30px;
}
a,
a:hover,
a:visited {
    color: red;
    text-decoration: none;
}
.disable-selection {
    -moz-user-select: none; /* Firefox */
    -ms-user-select: none; /* Internet Explorer */
    -khtml-user-select: none; /* KHTML browsers (e.g. Konqueror) */
    -webkit-user-select: none; /* Chrome, Safari, and Opera */
    -webkit-touch-callout: none; /* Disable Android and iOS callouts*/
}
h1::after {
    content: " V 2.0";
    font-size: 12px;
    position: absolute;
    top: 3px;
    padding-left: 5px;
    font-weight: 400;
}
h2::after {
    content: "2";
    font-size: 12px;
    position: absolute;
    top: 14px;
    padding-left: 5px;
}