add button class

src/styles.scss

@@ -19,7 +19,7 @@ body {
   height: 100%;
 }
 
-button {
+.button, button {
   background-color: vars.$accent-color;
   color: #000;
   text-transform: uppercase;
@@ -28,12 +28,14 @@ button {
   cursor: pointer;
   border-radius: 5px;
   transition: background-color vars.$link-hover-animation-time linear;
+  text-decoration: none;
 
   &:hover,
   &:active,
   &:focus {
     background-color: vars.$accent-color-2;
     outline: none;
+    color: #000;
   }
 }