*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    padding: 50px;
    margin: 0;
    font-family: "Open Sans", sans-serif;
    font-size: 16px;
    font-weight: 300;
    color: #333;
}

.wrapper {
    display: flex;
    flex-wrap: wrap;
    width: 90vw;
    max-width: 700px;
    margin: 0 auto;
}

header {
    width: 100%;
    margin-bottom: 50px;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 20px;
}

header a {
    font-size: 14px;
    color: #888;
}

section {
    flex: 1 0 0;
    display: flex;
    flex-direction: column;
    width: 50%;
    padding: 10px;
}

section h2 {
    margin: 0;
    margin-bottom: 20px;
    font-size: 18px;
    text-align: center;
}

.card {
    padding: 12px;
    border: 1px solid #e0e0e0;
    border-radius: 3px;
    background-color: #fff;
    cursor: pointer;
    box-shadow:
        0 15px 35px rgba(40, 40, 40, 0.1),
        0 5px 15px rgba(0, 0, 0, 0.05);
    transition: opacity 300ms ease;
}

.card.dragging {
    opacity: 0.25;
}

.card.dropzone {
    border: 2px dotted #e0e0e0;
}

.card:not(:first-child) {
    margin-top: 10px;
}

.card:not(:last-child) {
    margin-bottom: 10px;
}

.card img {
    display: block;
    max-width: 100%;
}

.card p:first-child {
    margin-top: 0;
}

.card p:last-child {
    margin-bottom: 0;
}

.dropzone {
    flex-grow: 1;
    overflow: auto;
    transition: 300ms ease;
    transition-property: border-color, background-color;
}

.dropzone.dragover {
    border-color: #ffc107;
    background-color: #fffde7;
}

.dropzone div {
    text-align: left;
}

.dropzone div:not(:first-child) {
    margin-top: 16px;
}

.dropzone div:not(:last-child) {
    margin-bottom: 16px;
}

.dropzone h3 {
    margin: 0;
    font-size: 12px;
    text-transform: uppercase;
}

.dropzone p {
    margin: 0;
    font-size: 14px;
}