HTMLify

body {
    font-family: 'Montserrat', sans-serif;
    margin: 0;
    background: #121314;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    align-content: center;
    flex-wrap: wrap;
    width: 80vw;
    margin: 0 auto;
    min-height: 100vh;
}

.btn {
    flex: 1 1 auto;
    margin: 10px;
    padding: 30px;
    text-align: center;
    text-transform: uppercase;
    transition: 0.5s;
    background-size: 200% auto;
    color: #151515;
    border-radius: 10px;
}

.btn:hover {
    background-position: right center;
}

.btn-1 {
    background-image: linear-gradient(to right, #f6d365 0%, #fda085 51%, #f6d365 100%);
}

.btn-2 {
    background-image: linear-gradient(to right, #fbc2eb 0%, #a6c1ee 51%, #fbc2eb 100%);
}

.btn-3 {
    background-image: linear-gradient(to right, #84fab0 0%, #8fd3f4 51%, #84fab0 100%);
}

.btn-4 {
    background-image: linear-gradient(to right, #a1c4fd 0%, #c2e9fb 51%, #a1c4fd 100%);
}

.btn-5 {
    background-image: linear-gradient(to right, #ffecd2 0%, #fcb69f 51%, #ffecd2 100%);
}