Design `strong` and `dl`.

user/themes/textbook/css/custom.css

 
+/** General Theme **/
+
+strong {
+    color: #c96233;
+}
+
+dl dt {
+    display: inline;
+    padding: 0.25rem 0.4rem;
+    background: #4e4e4e;
+    color: #eaeaea;
+    border-radius: 0.25rem;
+}
+
+dl dd {
+    border-bottom-left-radius: .5rem;
+    border-left: 3px solid #4e4e4e;
+
+    margin-bottom: 0.9rem;
+    padding-left: 0.618rem;
+    padding-top: 0.618rem;
+    padding-bottom: 0.309rem;
+    position: relative;
+    top: -0.5rem;
+}
+
+dl dd:hover {
+    border-top-right-radius: .5rem;
+    border-right: 3px solid #4e4e4e;
+}
+
+dd p {
+    margin-bottom: 0.7em;
+}
+
+/****/
+
 /* Hotfix for https://github.com/getgrav/grav-theme-quark/issues/9 */
 section#header { z-index: 10; }