diff --git a/aulas/stylesheets/extra.css b/aulas/stylesheets/extra.css
index 96c6359e..79bee417 100644
--- a/aulas/stylesheets/extra.css
+++ b/aulas/stylesheets/extra.css
@@ -1,30 +1,32 @@
 .center {
-    display: block;
-    margin-left: auto;
-    margin-right: auto;
+  display: block;
+  margin-left: auto;
+  margin-right: auto;
 }
 
-
 div.mermaid {
-    text-align: center;
+  text-align: center;
 }
 
 .shadow {
-    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
+  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
 }
 
-
 .shadow-png {
   filter: drop-shadow(3px 3px 3px #222);
 }
 
 .sbs {
-    /* side-by-side grid
+  /* side-by-side grid
     img | text
     or
     text | img */
-    display: grid;
-    column-gap: 20px;
-    grid-template-columns: auto auto;
-    align-items: center;
+  display: grid;
+  column-gap: 20px;
+  grid-template-columns: auto auto;
+  align-items: center;
+}
+
+.md-typeset .md-button {
+  padding: 0.625rem 1.25rem;
 }