Beautiful 404 error page - Flatsome theme

style.css

/*404*/
.error-404{padding:0; margin:0}
.error-404 .medium-3 {
    max-width: 100%;
    -ms-flex-preferred-size: 100%;
    flex-basis: 100%;
    text-align: center;
    font-size: 45px!important;
    padding: 0;
    margin: 0
}
.error-404 .header-font:after{
   content: "404";
    color: #e9ebe7;
    position: absolute;
    top: 0;
    left: 50%;
    -webkit-transform: translate(calc(-50% + 22px),14px);
    -ms-transform: translate(calc(-50% + 22px),14px);
    transform: translate(calc(-50% + 22px),14px);
    z-index: 0;
}
.error-404 .medium-9 {
    max-width: 100%;
    -ms-flex-preferred-size: 100%;
    flex-basis: 100%;
    text-align: center;
}
.error-404 .page-content{
    width: 766px;
    text-align: center;
    display: block;
    margin: 0 auto;
}
/*end 404*/