<div class="promo--button button"><span>Скачать</span></div>

@import url('https://fonts.googleapis.com/css?family=Cormorant+SC&display=swap&subset=cyrillic,cyrillic-ext');
.button {
     width: 430px;
     cursor: pointer;
     position: relative;
     height: 130px;
     display: -ms-flexbox;
     display: flex;
     -ms-flex-align: center;
     align-items: center;
     -ms-flex-pack: center;
     justify-content: center;
     font-size: 22px;
     font-family: 'Cormorant SC', serif;
     line-height: 22px;
}
@media (max-width: 720px) {
     .button {
         width: 300px;
         height: 90px;
         font-size: 16px;
         font-family: 'Cormorant SC', serif;
         line-height: 22px;
    }
}
.button::before, .button::after {
     background-image: url(/glowing/button/img/Glowing_Button.png);
     background-size: 100% auto;
     background-repeat: no-repeat;
     content: '';
     display: block;
     position: absolute;
     left: 0;
     top: 0;
     width: 100%;
     height: 100%;
     transition: opacity 0.5s ease-out;
}
.button::before {
     background-position: center top;
     opacity: 1;
}
.button::after {
     background-position: center bottom;
     opacity: 0;
}
.button:hover::before,
.button:active::before {
     opacity: 0;
}
.button:hover::after,
.button:active::after {
     opacity: 1;
}