style: fix custom-block css code style

src/client/theme-default/styles/custom-blocks.css

@@ -2,6 +2,7 @@
   font-weight: 600;
   margin-bottom: -0.4rem;
 }
+
 .custom-block.tip,
 .custom-block.warning,
 .custom-block.danger {
@@ -10,32 +11,40 @@
   border-left-style: solid;
   margin: 1rem 0;
 }
+
 .custom-block.tip {
   background-color: #f3f5f7;
   border-color: #42b983;
 }
+
 .custom-block.warning {
   background-color: rgba(255, 229, 100, 0.3);
   border-color: #e7c000;
   color: #6b5900;
 }
+
 .custom-block.warning .custom-block-title {
   color: #b29400;
 }
+
 .custom-block.warning a {
   color: var(--text-color);
 }
+
 .custom-block.danger {
   background-color: #ffe6e6;
   border-color: #c00;
   color: #4d0000;
 }
+
 .custom-block.danger .custom-block-title {
   color: #900;
 }
+
 .custom-block.danger a {
   color: var(--text-color);
 }
+
 .custom-block.details {
   display: block;
   position: relative;
@@ -44,14 +53,17 @@
   padding: 1.6em;
   background-color: #eee;
 }
+
 .custom-block.details h4 {
   margin-top: 0;
 }
+
 .custom-block.details figure:last-child,
 .custom-block.details p:last-child {
   margin-bottom: 0;
   padding-bottom: 0;
 }
+
 .custom-block.details summary {
   outline: none;
   cursor: pointer;