Remove incorrect CSS property

Author: Privat33r-dev

python_docs_theme/static/pydoctheme.css

@@ -361,7 +361,6 @@ div.genindex-jumpbox a {
     position: absolute;
     top: 0;
     right: 0;
-    text-size: 75%;
     font-family: Menlo, Consolas, Monaco, Liberation Mono, Lucida Console, monospace;
     padding-left: 0.2em;
     padding-right: 0.2em;