.btn {
    border-radius: 100%;
    text-align: center;
    font-size: 1.4rem;
    display: inline-block;
    position: relative;
}

.btn i {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.btn.success {
    background-color: #a3bd31;
    color: #fff;
}

.btn.danger {
    background-color: #FD4815;
    color: #fff;
}
.btn.primary {
    background-color: #EE4459;
    color: #fff;
}