Fix minor css issue (#7)

- Fix minor css issue (8c1776d62e6b46447f46b95cfcffd9ecdcb633ff)

assets/css/custom.css

@@ -101,9 +101,11 @@ img[src*="#chart-icon"] {
   place-content: baseline center;
   position: fixed;
   width: 100%;
+  height: 2rem;
 }
 
 .anchor-div {
   display: flex;
   flex-direction: row;
+  justify-content: center;
 }