html,
body {
    height: 100%;
}

#content-wrap {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

#image-container {
    width: 500px;
    height: 300px;
    overflow: hidden;
}

#image-container img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

#appear-btn {
    margin-top: 40px;
    padding: 20px 40px;
    font-size: 1.4rem;
    border: 2px solid gold;
    transition: all 300ms linear;
    background: #EEAECA;
    background: radial-gradient(circle, rgba(238, 174, 202, 1) 0%, rgba(148, 187, 233, 1) 100%);
    cursor: pointer;
}

#appear-btn:hover {
    color: gold;
}