[mod] default and error pages for web container

- removed volume for web as this is a placeholder

web/files/html/css/main.css

@@ -0,0 +1,43 @@
+.spacer:after {
+    content: ".";
+    display: block;
+    clear: both;
+    visibility: hidden;
+    line-height: 0;
+    height: 10px;
+}
+body {
+    font-family: 'Overpass Mono', monospace;
+    background-color: rgb(46, 46, 46);
+    color: #fff;
+}
+
+html, button, input, select, textarea,
+.pure-g [class *= "pure-u"] {
+    /* pure.css font */
+    font-family: 'Overpass Mono', monospace;
+}
+
+.center-elements {
+    display:flex;
+    justify-content:center;
+    align-items:center;
+    text-align: center;
+}
+
+.vert-10 { height: 10vh }
+.vert-20 { height: 20vh }
+.vert-30 { height: 30vh }
+.vert-40 { height: 40vh }
+.vert-50 { height: 50vh }
+.vert-60 { height: 60vh }
+.vert-70 { height: 70vh }
+.vert-80 { height: 80vh }
+.vert-90 { height: 90vh }
+
+.status-code .code{
+    font-size: 40px;
+}
+.status-code .msg{
+    font-size: 20px;
+}