body {
    font-family: 'Ariel', sans-serif;
}

.files {
    display: flex;
    flex-wrap: wrap;
}

.file {
    display: flex;
    margin: 1em;
    border: 1px solid #449dfc;
    border-radius: 5px;
    padding: 1em;
}

.thumbnail {
    max-width: 320px;
    margin: 1em;
}

img {
    max-width: 100%;
}

[type="submit"] {
    border-radius: 1em;
    margin: 1em;
    padding: 1em;
}

.uploadform {
    display: flex;
    margin: 1em;
    background-color: #e5f0fc;
    border: 1px solid #449dfc;
    border-radius: 5px;
    padding: 1em;
}

/* https://benmarshall.me/styling-file-inputs/ */
[type="file"] {
    border: 0;
    clip: rect(0, 0, 0, 0);
    height: 1px;
    overflow: hidden;
    padding: 0;
    position: absolute !important;
    white-space: nowrap;
    width: 1px;
}
        
[type="file"] + label {
    background-color: rgb(0, 86, 112);
    border-radius: 1em;
    color: #fff;
    cursor: pointer;
    display: inline-block;
    padding: 1em;
    margin: 1em;
    transition: background-color 0.3s;
}
                           
[type="file"]:focus + label,
[type="file"] + label:hover {
    background-color: #67b0ff;
}

[type="file"]:focus + label {
    outline: 1px dotted #000;
    outline: -webkit-focus-ring-color auto 5px;
}

@media screen and (max-width: 980px) { /* This is the screen width of a OnePlus 5t */
    body {
        font-size: xx-large;
    }

    [type="submit"] {
        font-size: xx-large;
        width: 100%;
    }

    .uploadform {
        display: flex;
    }

    [type="file"] + label {
        width: 100%;
    }

    .thumbnail {
        max-width: 100%;
        margin: 1em;
    }

    .file {
        display: flex;
        flex-direction: column;
        width: 100%;
    }
}