chore: add english comment

src/layouts/Layout.css

@@ -1,23 +1,27 @@
 @media screen and (max-width: 480px) {
-  /* 在小屏幕的时候可以有更好的体验 */
   .umi-plugin-layout-container {
     width: 100% !important;
   }
+
   .umi-plugin-layout-container > * {
     border-radius: 0 !important;
   }
 }
+
 .umi-plugin-layout-menu .anticon {
   margin-right: 8px;
 }
+
 .umi-plugin-layout-menu .ant-dropdown-menu-item {
   min-width: 160px;
 }
+
 .umi-plugin-layout-right {
   display: flex !important;
   height: 100%;
   overflow: hidden;
 }
+
 .umi-plugin-layout-right .umi-plugin-layout-action {
   display: flex;
   align-items: center;
@@ -26,25 +30,32 @@
   cursor: pointer;
   transition: all 0.3s;
 }
+
 .umi-plugin-layout-right .umi-plugin-layout-action > i {
-  color: rgba(255, 255, 255, 0.85);
+  color: rgba(255, 255, 255, 85%);
   vertical-align: middle;
 }
+
 .umi-plugin-layout-right .umi-plugin-layout-action:hover {
-  background: rgba(0, 0, 0, 0.025);
+  background: rgba(0, 0, 0, 2.5%);
 }
+
 .umi-plugin-layout-right .umi-plugin-layout-action.opened {
-  background: rgba(0, 0, 0, 0.025);
+  background: rgba(0, 0, 0, 2.5%);
 }
+
 .umi-plugin-layout-right .umi-plugin-layout-search {
   padding: 0 12px;
 }
+
 .umi-plugin-layout-right .umi-plugin-layout-search:hover {
   background: transparent;
 }
+
 .umi-plugin-layout-name {
   margin-left: 8px;
 }
+
 .umi-plugin-layout-name.umi-plugin-layout-hide-avatar-img {
   margin-left: 0;
 }