.btn {
 display: inline-block;
 padding: 0.9rem 1.8rem;
 font-size: 16px;
 font-weight: 700;
 color: white;
 border: 3px solid rgb(252, 70, 100);
 cursor: pointer;
 position: relative;
 background-color: transparent;
 text-decoration: none;
 overflow: hidden;
 z-index: 1;
 font-family: inherit;
}

.btn::before {
 content: "";
 position: absolute;
 left: 0;
 top: 0;
 width: 100%;
 height: 100%;
 background-color: rgb(252, 70, 100);
 transform: translateX(-100%);
 transition: all .3s;
 z-index: -1;
}

.btn:hover::before {
 transform: translateX(0);
}