html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

.parent404 {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    overflow: auto;
}

.block404 {
    width: 338px;
    height: 121px;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    margin: auto;
    
    img {
        max-width: 100%;
        height: auto;
        display: block;
        margin: 0 auto;
        border: none;
    }
}

.block404 a {
	transition: 0.3s;
}

.block404 a:hover {
	opacity: 0.9;
	transition: 0.1s;
}