.acf-field-securimage #captcha_code {
    max-width: 140px;
}
.acf-field-securimage #captcha_image {
    border: 1px solid #989898;
}
.acf-securimage-image {
    position: relative;
    width: auto;
    display: inline-block;
}
.acf-securimage-image.refreshing:before {
    content: 'Loading...';
    display: block;
    position: absolute;
    top:  0;
    left:  0;
    height: 100%;
    background: rgba(255,255,255,.7);
    text-align: center;
    width: 100%;
    padding-top: 10px;
}