#block-customtopbuttons, #reveal--customtopbuttons { 
  --button-style: none; 
  --button-background-color: #0072ce; 
  --button-background-color-hover: #00589e; 
  --button-font-color: #fefefe; 
  --button-font-size: 14px; 
  --button-border-color: transparent; 
  --button-border-color-hover: transparent; 
  --background-style: solid; 
}