<a href="#" class="button14">Скачать</a>

a.button14 {
  display: inline-block;
  text-shadow: 1px 1px #fff;
  text-decoration: none;
  padding: .3em 1em;
  border: 1px solid #aaa;
  border-radius: 100px;
  outline: none;
  background: #d6dbbf no-repeat;
  background-image:
   linear-gradient(to left, #aaa, #aaa),
   linear-gradient(to left, #feffe8, #feffe8),
   linear-gradient(#feffe8, #d6dbbf);
  background-position: calc(100% - 2.7em) 0, calc(100% - 2.7em + 1px) 0, 0 0;
  background-size: 1px 100%, 1px 100%, auto auto;
  overflow: hidden;
}
a.button14:after {
  content: "\bb";
  position: relative;
  bottom: 0;
  display: inline-block;
  margin-left: 1.4em;
  vertical-align: middle;
  font-family: "Times","Times New Roman","serif","sans-serif","EmojiSymbols";
  font-weight: 700;
  font-size: 140%;
  -webkit-transform: rotate(90deg);
  transform: rotate(90deg);
}
a.button14:hover {
  background-color: #fdfd9f;
  background-image:
   linear-gradient(to left, #aaa, #aaa),
   linear-gradient(to left, #feffe8, #feffe8),
   linear-gradient(#fffce7, #fdfd9f);
}
a.button14:active:after {
  bottom: -1.2em;
  transition: .3s;
}