-Ejemplo de un estilo CSS para aplicar sobre una lista.

.menu-primary a{
  width: 80%;
  border: 3px solid #27292b !important;
  background-color: #212024;
  list-style: none !important;
  margin: 0 !important;
 margin-left: 10% !important;
  padding-top: 2px !important; 
  font-size: 15px;
  font-weight: bold;
  text-align: center;
}



.menu-primary a:hover{
  width: 80%;
  border: 3px solid #27292b !important;
  background-color: #5b5b5b;
  list-style: none !important;
  margin: 0 !important;
 margin-left: 10% !important;
  padding-top: 2px !important; 
  font-size: 15px;
  font-weight: bold;
  text-align: center;
}