html,
body {
    background-color: #181D25;
    overscroll-behavior-x: none;
}

.center {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%);
    max-width: 150px;

    -webkit-animation: fadein 2s;
    /* Safari, Chrome and Opera > 12.1 */
    -moz-animation: fadein 2s;
    /* Firefox < 16 */
    -ms-animation: fadein 2s;
    /* Internet Explorer */
    -o-animation: fadein 2s;
    /* Opera < 12.1 */
    animation: fadein 2s;
}

@keyframes fadein {
    from {
        opacity: 0.6;
    }

    to {
        opacity: 1;
    }
}

/* Firefox < 16 */
@-moz-keyframes fadein {
    from {
        opacity: 0.6;
    }

    to {
        opacity: 1;
    }
}

/* Safari, Chrome and Opera > 12.1 */
@-webkit-keyframes fadein {
    from {
        opacity: 0.6;
    }

    to {
        opacity: 1;
    }
}

/* Internet Explorer */
@-ms-keyframes fadein {
    from {
        opacity: 0.6;
    }

    to {
        opacity: 1;
    }
}