// Custom styles.
#rewardButton span {
    display: inline-block;
    width: 80px;
    height: 35px;
    border-radius: 5px;
    color: #fff;
    font-weight: 400;
    font-style: normal;
    font-variant: normal;
    font-stretch: normal;
    font-size: 18px;
    font-family: "Microsoft Yahei";
    background: #f44336;
}
#rewardButton {
    cursor: pointer;
    border: 0;
    outline: 0;
    border-radius: 100%;
    padding: 0;
    margin: 0;
    letter-spacing: normal;
    text-transform: none;
    text-indent: 0px;
    text-shadow: none;
}