#frameWrapper {
    position: relative;
    width: 90%;
    height: 70%;
    overflow: hidden;
    margin: auto;
    border: 1px solid white;
    outline: 1px solid #444;
    border-radius: 8px;
    background-color: #FFF;
    z-index: 0;
}

#frameWrapper::after {
    content: "載入中 Loading...";
    position: absolute;
    transform: translate(-50%);
    left: 50%;
    top: 50%;
    color: black;
    z-index: -2;
}

#frame {
    width: 100%;
    height: calc(100% + 515px);
    margin-top: -515px;
}