Add a modal for controls

src/style.css

@@ -43,7 +43,7 @@ input {
   background-color: transparent;
   transition: border-color 0.25s;
 }
-button {
+button, .button {
   border-radius: 8px;
   border: 1px solid transparent;
   padding: 0.6em 1.2em;
@@ -53,8 +53,10 @@ button {
   background-color: #1a1a1a;
   cursor: pointer;
   transition: border-color 0.25s;
+  text-decoration: none;
+  color: inherit;
 }
-button:hover {
+button:hover, .button:hover {
   border-color: #646cff;
 }
 button:focus,
@@ -184,12 +186,47 @@ graph-editor {
   float: right;
 }
 
+table {
+  width: 100%;
+}
+th, td {
+  border-bottom: thin solid hsla(0, 0%, 100%, .12);
+  height: 48px;
+  padding: 0 16px;
+}
+
+.modal[hidden] {
+  display: none;
+}
+
+.modal {
+  position: fixed;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: rgba(0, 0, 0, .8);
+  animation: fadeIn .3s both
+}
+
+.modal-content {
+  overflow: auto;
+  width: 600px;
+  max-width: calc(100vw - 20px);
+  max-height: calc(100vh - 20px);
+  padding: 20px;
+  background-color: #1a1a1a;
+}
+
 @media (prefers-color-scheme: light) {
   :root {
     color: #213547;
     background-color: #ffffff;
   }
-  button {
+  button, .btn {
     background-color: #f9f9f9;
   }
   .context-menu {