style.css

html, body {
    padding: 10px;
    min-width: 400px;
}
#dnd {
    text-align: center;
    border: 3px dashed #a5a5a5;
    color: #a5a5a5;
    font-weight: bold;
    text-align: center;
    width: 100%;
    height: 100%;
    padding: 50px 10px;
    box-sizing: border-box;
    margin-top: 10px;
}
#dnd_parsing {
    display: none;
}
input[type="file"] {
    height: 0.1px;
    color: #ffffff;
    width: 0.1px;
    border: none;
    position: absolute;
    top: 0;
    left: 0;
    margin: 0;
    padding: 0;
    font-size: 0.1px;
    z-index: -1;
    overflow: hidden;
    opacity: 0;
}
#message-container {
    margin-top: 10px;
}
.message {
    box-sizing: border-box;
    border: 1px solid;
    margin: 3px 0;
}
.message .title {
    display: block;
    line-height: 20px;
    padding: 5px 15px 5px 5px;
    font-weight: bold;
    font-size: 14px;
    cursor: pointer;
}
.message .checkbox + .message .title {
    margin-left: 30px;
}
.message .title:after {
    content: '+';
    display: block;
    float: right;
    font-weight: bold;
    font-size: 18px;
    line-height: 20px;
    padding-left: 10px;
    right: 0;
}
.message.open .title:after {
    content: '-';
}
.message.success {
    background-color: #9bf7a6;
    border-color: #72b579;
}
.message.error, #close-btn {
    background-color: #f79b9b;
    border-color: #b57272;
}
.message.warn {
    background-color: #e5df90;
    border-color: #b5b072;
}
.message ul {
    visibility: hidden;
    height: 0;
    overflow: hidden;
    padding: 0;
    margin: 0;
    list-style-type: none;
}
.message.open ul {
    visibility: visible;
    height: auto;
}
.message ul li {
    padding: 3px 5px;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    height: 20px;
    line-height: 20px;
    display: block;
    max-width: 300px;
}
.message ul li:before {
    content: '\002713';
    margin-right: 5px;
}
.message ul li.success {
    background-color: #9bf7a6;
}
.message ul li.error {
    background-color: #f79b9b;
}
.message ul li.error:before {
    content: '\002715';
}
.message ul.no-icon li:before {
    content: '' !important;
}
.message ul li .domain {
    float: right;
}
.message ul li img {
    width: 16px;
    vertical-align: middle;
    margin-right: 5px;
}
.message .checkbox {
    width: 20px;
    height: 20px;
    float: left;
    padding: 5px;
}
.message .checkbox .inner {
    border-radius: 2px;
    background-color: #fdfacd;
    height: 100%;
    width: 100%;
    line-height: 20px;
    text-align: center;
    cursor: pointer;
}
.message .checkbox .inner.selected:before {
    content: '\002714';
}
#close-btn {
    padding: 5px;
    text-align: center;
    cursor: pointer;
    margin: 5px 0;
    border: 1px solid;
}