.b-id-btn {
    text-align: center;
    margin: 20px auto;
}
.b-id-btn .b-id-btn-main {
    border-radius: 5px;
    text-decoration: none;
    display: inline-block;
    margin-top: 20px;
    padding: 11px 60px;
    font-size: 20px;
    position: relative;
    transition: .3s;
}
.b-id-btn .b-id-btn-main:hover {
    transition: .3s;
    opacity: .7;
}
.b-id-btn .b-id-btn-main::after {
    content: '';
    width: 10px;
    height: 10px;
    border-top: solid 2px;
    border-right: solid 2px;
    -ms-transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
    position: absolute;
    top: 50%;
    right: 1.5rem;
    margin-top: -5px;
}