Ghost/ghost/admin/app/styles/components/uploader.css

/* Image Uploader
/* ---------------------------------------------------------- */

.gh-image-uploader {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow: hidden;
    margin: 1.6em 0;
    min-height: 130px;
    width: 100%;
    background: #fff;
    border-radius: 4px;
    color: color(var(--midgrey) l(-18%));
    text-align: center;
    border-radius: 4px;
}

.gh-image-uploader.-drag-over {
    border: 2px solid;
}

.gh-image-uploader.-with-image {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 2px;
}

.gh-image-uploader img {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    line-height: 0;
}

.gh-image-uploader .image-cancel {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 300;
    display: block;
    padding: 8px;
    background: rgba(0, 0, 0, 0.6);
    border-radius: var(--border-radius);
    box-shadow: rgba(255, 255, 255, 0.2) 0 0 0 1px;
    color: #fff;
    text-decoration: none;
    font-size: 13px;
    line-height: 10px;
}

.gh-image-uploader .upload-form {
    flex-grow: 1;
    display: flex;
    flex-direction: row;
}

.gh-image-uploader .x-file-input {
    flex-grow: 1;
    display: flex;
}

.gh-image-uploader .x-file-input label {
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    outline: none;
}

.gh-image-uploader .description {
    width: 100%;
    text-align: center;
    font-size: 1.6rem;
}

.gh-image-uploader .image-cancel:hover {
    background: var(--red);
    color: #fff;
    cursor: pointer;
}

.gh-image-uploader .progress-container {
    flex-grow: 1;
    display: flex;
    flex-direction: row;
    align-items: center;
    width: 100%;
}

.gh-image-uploader .progress {
    overflow: hidden;
    margin: 0 auto;
    width: 60%;
    background: linear-gradient(to bottom, #f5f5f5, #f9f9f9);
    border-radius: 12px;
    box-shadow: rgba(0, 0, 0, 0.1) 0 1px 2px inset;
}

.gh-image-uploader .failed {
    margin: 1em 2em;
    font-size: 16px;
}

.gh-image-uploader .bar {
    height: 12px;
    background: var(--blue);
}

.gh-image-uploader .bar.fail {
    width: 100% !important;
    background: var(--red);
}

/* Try Again button */
.gh-image-uploader .gh-btn-green:last-child {
    margin-top: 1em;
    margin-bottom: 3em;
}