.iframe-wrapper {
    position: relative;
}

.placeholder {
    position: absolute !important;
    height: 100%;
    width: 100%;
    top: 0;
    left: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: #dde0db;
    z-index: 1;
}

.placeholder * {
    margin: 4px;
}