show keyboard shortcuts

style.css

@@ -6,81 +6,81 @@ h1 {
     text-align: center;
 }
 
-div {
+section, div {
     display: flex;
     row-gap: 0.5em;
     column-gap: 0.5em;
     margin: 1em auto;
     justify-content: center;
     text-align: center;
-    align-items: center;
+    align-items: baseline;
 }
 
-table {
+.grid {
     border-spacing: 0;
     border: 1px solid black;
     border-radius: 6px;
 }
 
-td, tr {
+.grid td, tr {
     padding: 0;
 }
 
-tr:first-child td:first-child {
+.grid tr:first-child td:first-child {
     border-top-left-radius: 5px;
 }
 
-tr:first-child td:first-child input {
+.grid tr:first-child td:first-child input {
     border-top-left-radius: 4px;
 }
 
-tr:first-child td:last-child {
+.grid tr:first-child td:last-child {
     border-top-right-radius: 5px;
 }
 
-tr:first-child td:last-child input {
+.grid tr:first-child td:last-child input {
     border-top-right-radius: 4px;
 }
 
-tr:last-child td:first-child {
+.grid tr:last-child td:first-child {
     border-bottom-left-radius: 5px;
 }
 
-tr:last-child td:first-child > input {
+.grid tr:last-child td:first-child > input {
     border-bottom-left-radius: 4px;
 }
 
-tr:last-child td:last-child {
+.grid tr:last-child td:last-child {
     border-bottom-right-radius: 5px;
 }
 
-tr:last-child td:last-child input {
+.grid tr:last-child td:last-child input {
     border-bottom-right-radius: 4px;
 }
 
-tr:nth-child(3n+1) td {
+.grid tr:nth-child(3n+1) td {
     border-top: 1px solid black;
 }
 
-tr:nth-child(3n+2) td {
+.grid tr:nth-child(3n+2) td {
     border-top: 1px solid grey;
     border-bottom: 1px solid grey;
 }
 
-tr:nth-child(3n) td {
+.grid tr:nth-child(3n) td {
     border-bottom: 1px solid black;
 }
 
-td:nth-child(3n+1) {
+.grid td:nth-child(3n+1) {
     border-left: 1px solid black;
 }
 
-td:nth-child(3n+2) {
+.grid td:nth-child(3n+2) {
     border-left: 1px solid grey;
     border-right: 1px solid grey;
 }
 
-td:nth-child(3n+3) {
+.grid td:nth-child(3n+3) {
     border-right: 1px solid black;
 }
 
@@ -91,7 +91,7 @@ input {
     border: 0;
     padding: 0;
     text-align: center;
-    transition: 0.3s;
+    transition: 0.5s;
 }
 
 input:enabled {
@@ -129,11 +129,35 @@ input::placeholder {
 .buttons {
     flex-wrap: wrap;
     column-gap: 0.2em;
-    margin: 0;
 }
 
 input[type="color"] {
     font-size: 1em;
+    align-self: center;
+}
+
+.shortcuts caption {
+    text-decoration: underline;
+}
+
+.shortcuts td {
+    text-align: left;
+}
+
+kbd {
+    /* from https://developer.mozilla.org */
+    background-color: #eee;
+    border-radius: 3px;
+    border: 1px solid #b4b4b4;
+    box-shadow: 0 1px 1px rgba(0,0,0,.2),0 2px 0 0 rgba(255,255,255,.7) inset;
+    color: #333;
+    display: inline-block;
+    font-family: consolas,"Liberation Mono",courier,monospace;
+    font-size: .85em;
+    font-weight: 700;
+    line-height: 1;
+    padding: 4px;
+    white-space: nowrap;
 }
 
 a {