.btn {
    display: inline-block;
    float: left;
    padding: 10px 30px;
    background-color: var(--second-color);
    color: #fff;
    font-size: 18px;
    line-height: 20px;
    border-radius: 4px;
    cursor: pointer;
    opacity: 80%;
    box-shadow: 5px 5px 10px #0008;
    text-align: center;
    border: none;
}
    .btn:hover {
        box-shadow: 5px 5px 10px #000a;
        opacity: 100%;
    }
    .btn.circle {
        width: 40px;
        border-radius: 50%;
        position: absolute;
        top: -21px;
        right: -15px;
      }
      .btn.circle-main-color {
        background-color: var(--main_color);
        color: white;
      }
      .btn.circle-main-color {
        background-color: var(--secondary-color);
        color: white;
      }