.boton-galeria-url {
display:inline-block;
  position:relative;
  padding: 20px 0;
  background-color: #4CAF50;
  color: white;
  text-decoration: none;
  font-size: 20px;
  border: none;
  cursor: pointer;
  margin-top: -20px;
  margin-bottom: 15px;
  font-weight: bold;
  width: 100%;

-webkit-border-bottom-right-radius: 8px;
-webkit-border-bottom-left-radius: 8px;
-moz-border-radius-bottomright: 8px;
-moz-border-radius-bottomleft: 8px;
border-bottom-right-radius: 8px;
border-bottom-left-radius: 8px;

}

.boton-galeria-url:hover {
  background-color: #45a049;
}
.boton-galeria-url span {
  color: white;
}