Fix themeing for all browsers

Really noticable on iOS, but ensuring all browsers get the love.

The buttons and input aren't as flat as they usually are on my desktop Firefox. This patch should sort that out.

static/style.css

@@ -205,6 +205,8 @@ select, #search {
 	padding: 0 15px;
 	height: 40px;
 	appearance: none;
+	-webkit-appearance: none;
+	-moz-appearance: none;
 	border-radius: 5px 0px 0px 5px;
 }
 
@@ -659,6 +661,11 @@ input[type="submit"]:hover { color: var(--accent); }
 	margin-top: 20px;
 }
 
+input[type="submit"] {
+	appearance: none;
+	-webkit-appearance: none;
+	-moz-appearance: none;
+}
 /* Markdown */
 
 .md > *:not(:first-child) {