quay/static/css/pages/error-view.css

.error-view-element {
    text-align: center;
}

.error-view-element h2 {
    font-size: 42px;
    margin-bottom: 10px;
}

.error-view-element h2 .repo-circle {
    margin-right: 16px;
}

.error-view-element h3 {
    font-size: 24px;
}

.error-view-element img {
    margin-top: 20px;
    width: 255px;
    height: 235px;
    margin-bottom: 40px;
}

.error-view-element .err403 img {
    margin-top: 30px;
    width: 225px;
    height: 205px;
}

.error-view-element h2 .fa-exclamation-triangle {
  margin-right: 16px;
  color: #D64456;
}