contented/static/widget.html

<style type="text/css">
.contented {
    box-sizing:border-box;
    text-align: center;
    border: 8px dashed lightgrey;
    padding: 12px;
    background:white; /* not transparent */

    text-overflow:hidden;
    overflow:auto;
    width:100%;
    height:100%;

    position:relative;
}
.contented .contented-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 24px;
    height: 24px;
    cursor: pointer;
}
.contented .contented-upload-type-selector {
    display:block;
    margin-bottom: 1em;
    user-select: none; 
}
.contented .contented-upload-type {
    display:inline-block;
    opacity:0.2;
    transition:opacity linear 0.1s;
    cursor:pointer;
}
.contented .contented-upload-type:hover {
    opacity:0.5;
    transition:opacity linear 0s;
}
.contented .contented-upload-type svg {
    width:36px;
    height:36px;
}
.contented .contented-upload-type.contented-upload-type-active {
    opacity:1;
}
.contented.is-dragging {
    background: lightblue;
}
.contented-content-area {
    position:absolute;
    top: 60px;
    bottom: 10px;
    left: 10px;
    width: calc(100% - 20px);

    /* Prevent blur under translateY */
    -webkit-transform-style: preserve-3d;
    -moz-transform-style: preserve-3d;
    transform-style: preserve-3d;
}
.contented-content-area > div {
    position: relative;
    top: 50%;
    transform: translateY(-50%);
}
.contented-upload-if {
    display:none;
}
.contented-if-paste {
    height:100%;
}
.contented-upload-if.contented-active {
    display:block;
}
.contented textarea {
    resize: none;
    width:100%;
    height:calc(100% - 1em - 15px);
    box-sizing:border-box;
}
.contented-progress-bar {
    display: block;
    width:90%;
    margin:0.5em auto 0 auto;

    height:16px;
    border-radius:8px;
    background:lightgrey;
    position:relative;
}
.contented-progress-element {
    position:absolute;
    background:darkgreen;
    left:0;
    width:0%;
}
</style>
<div class="contented">

    <div class="contented-close">
        <svg viewBox="0 0 24 24">
            <path fill="#000000" d="M19,6.41L17.59,5L12,10.59L6.41,5L5,6.41L10.59,12L5,17.59L6.41,19L12,13.41L17.59,19L19,17.59L13.41,12L19,6.41Z" />
        </svg>
    </div>

    <div class="contented-upload-type-selector">

        <div class="contented-upload-type contented-upload-type-active" data-upload-type="drag" title="Drag and drop">
            <svg viewBox="0 0 24 24">
                <path fill="#000000" d="M5,20H19V18H5M19,9H15V3H9V9H5L12,16L19,9Z"></path>
            </svg>
        </div>

        <div class="contented-upload-type" data-upload-type="file" title="Multiple files">
            <svg viewBox="0 0 24 24">
                <path fill="#000000" d="M15,7H20.5L15,1.5V7M8,0H16L22,6V18A2,2 0 0,1 20,20H8C6.89,20 6,19.1 6,18V2A2,2 0 0,1 8,0M4,4V22H20V24H4A2,2 0 0,1 2,22V4H4Z"></path>
            </svg>
        </div>

        <div class="contented-upload-type" data-upload-type="paste" title="Paste">
            <svg viewBox="0 0 24 24">
                <path fill="#000000" d="M19,20H5V4H7V7H17V4H19M12,2A1,1 0 0,1 13,3A1,1 0 0,1 12,4A1,1 0 0,1 11,3A1,1 0 0,1 12,2M19,2H14.82C14.4,0.84 13.3,0 12,0C10.7,0 9.6,0.84 9.18,2H5A2,2 0 0,0 3,4V20A2,2 0 0,0 5,22H19A2,2 0 0,0 21,20V4A2,2 0 0,0 19,2Z" />
            </svg>
        </div>
    </div>
    
    <div class="contented-content-area">
        <div class="contented-upload-if contented-if-drag contented-active">
            <label>Drop files to upload <span class="contented-extratext"></span></label>
        </div>

        <div class="contented-upload-if contented-if-file">
            <label>Select files to upload <span class="contented-extratext"></span></label><br>
            <input class="contented-file-selector" type="file" multiple>
            <button class="contented-file-upload">Upload &raquo;</button>
        </div>

        <div class="contented-upload-if contented-if-paste">
            <textarea placeholder="Paste content here"></textarea>
            <button class="contented-paste-upload">Upload &raquo;</button>
        </div>

        <div class="contented-upload-if contented-if-progress">
            <label>...</label>
            <div class="contented-progress-bar"><div class="contented-progress-element"></div></div>
        </div>
    </div>
</div>