ui: contest-problem: update style

packages/ui-default/components/contest/contest.page.styl

@@ -54,9 +54,8 @@ for key, value in $contest-color
   row-gap: 0.75rem;
   column-gap: 0.5rem;
   padding-bottom: 0.5rem;
-  margin-top: 1rem;
-  margin-bottom: 0.5rem;
-  
+  width: rem(180px);
+
   > a
     text-decoration: none;
     background-color: transparent;
@@ -103,12 +102,3 @@ for key, value in $contest-color
       
       &:hover .icon
         display: none;
-
-  // .placeholder
-  //   cursor: pointer;
-  //   position: absolute;
-  //   top: -0.375rem;
-  //   right: -0.375rem;
-  //   bottom: -0.375rem;
-  //   left: -0.375rem;
-