put errors.css back

static/css/errors.css

@@ -0,0 +1,131 @@
+html,
+body {
+    height: 100%;
+    overflow: hidden;
+}
+
+.error-page {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    text-align: center;
+    height: 100%;
+    font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
+}
+
+.error-page h1 {
+    font-size: 30vh;
+    font-weight: bold;
+    position: relative;
+    margin: -8vh 0 0;
+    padding: 0;
+}
+
+.error-page h1:after {
+    content: attr(data-h1);
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    color: transparent;
+    /* webkit only for graceful degradation to IE */
+    background: -webkit-repeating-linear-gradient(
+        -45deg,
+        #71b7e6,
+        #69a6ce,
+        #b98acc,
+        #ee8176,
+        #b98acc,
+        #69a6ce,
+        #9b59b6
+    );
+    -webkit-background-clip: text;
+    -webkit-text-fill-color: transparent;
+    background-size: 400%;
+    text-shadow: 1px 1px 2px transparentize(#fff, 0.75);
+    animation: animateTextBackground 10s ease-in-out infinite;
+}
+
+.error-page h1 + p {
+    color: #d6d6d6;
+    font-size: 8vh;
+    font-weight: bold;
+    line-height: 10vh;
+    max-width: 600px;
+    position: relative;
+}
+
+.error-page h1 + p:after {
+    content: attr(data-p);
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    color: transparent;
+    text-shadow: 1px 1px 2px transparentize(#fff, 0.5);
+    -webkit-background-clip: text;
+    -moz-background-clip: text;
+    background-clip: text;
+}
+
+#tsparticles {
+    position: fixed;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    left: 0;
+}
+
+@keyframes animateTextBackground {
+    0% {
+        background-position: 0 0;
+    }
+
+    25% {
+        background-position: 100% 0;
+    }
+
+    50% {
+        background-position: 100% 100%;
+    }
+
+    75% {
+        background-position: 0 100%;
+    }
+
+    100% {
+        background-position: 0 0;
+    }
+}
+
+@media (max-width: 767px) {
+    .error-page h1 {
+        font-size: 32vw;
+    }
+
+    .error-page h1 + p {
+        font-size: 8vw;
+        line-height: 10vw;
+        max-width: 70vw;
+    }
+}
+
+a.back {
+    position: fixed;
+    right: 40px;
+    bottom: 40px;
+    background: -webkit-repeating-linear-gradient(-45deg, #71b7e6, #69a6ce, #b98acc, #ee8176);
+    border-radius: 5px;
+    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
+    color: #fff;
+    font-size: 16px;
+    font-weight: bold;
+    line-height: 24px;
+    padding: 15px 30px;
+    text-decoration: none;
+    transition: 0.25s all ease-in-out;
+}
+
+a.back:hover {
+    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
+}