Added category pinning

templates/style.css

@@ -1,3 +1,7 @@
+* {
+	box-sizing: border-box;
+}
+
 html {
 	font-family: 'Roboto', sans-serif;
 	background-color: #111111;
@@ -43,7 +47,7 @@ h3 {
 	padding: 0;
 	display: inline-block;
 }
-.todo-item form input, .navbar-form input {
+.todo-item form input, .navbar-form input, .todo-button {
 	border: 2px solid #333333;
 	padding: 5px;
 	margin: 0;
@@ -51,12 +55,15 @@ h3 {
 	color: white;
 	border-radius: 4px;
 }
-.todo-item form input:focus, .navbar-form input:focus {
+.todo-item form input:focus, .navbar-form input:focus, .todo-button:focus {
 	outline: none;
 }
-.todo-item form input:active, .navbar-form input:active {
+.todo-item form input:active, .navbar-form input:active, .todo-button:active {
 	background-color: #222222;
 }
+.todo-button {
+	margin: -5px;
+}
 
 summary, details[open] {
 	padding: 0.5em;
@@ -117,6 +124,9 @@ summary:focus {
 .navbar {
 	text-align: right;
 }
+.hidden {
+	display: none;
+}