Стилизуем кнопку штатной формы в Tilda - Live-CSS-3

<style>
.t700 button.t-submit {
    height: 100px;
    padding-left: 80px;
    padding-right: 90px;
    background-color: transparent !important;
    background-image: linear-gradient(90deg, #d1ffd3, #4ab740);
    box-shadow: 0 22px 17px -20px rgb(0 0 0 / 49%);
}
.t700  button.t-submit:after {
    content: "";
    background-image: url(https://static.tildacdn.com/tild3438-6566-4263-b064-383264646633/fingerprint_icon_191.svg);
    display: block;
    width: 30px;
    height: 30px;
    position: absolute;
    right: 50px;
    top: 50%;
    transform: translateY(-50%);
    background-size: contain;
    background-repeat: no-repeat;
}
.t700  .t-container:last-child {
    box-shadow: 0 0 30px 0 rgb(0 0 0 / 12%);
    padding: 50px 0;
    border-radius: 10px;
}    
</style>