ul {
    list-style-type: none;
}

li {
    display: inline-block;
}

input[type="checkbox"][id^="myCheckbox"] {
    display: none;
}

label {
    border: 1px solid #fff;
    padding: 0px; /*original 10px*/
    display: block;
    position: relative;
    margin: 10px;
    cursor: pointer;
}

    label:before {
        background-color: white;
        color: white;
        content: " ";
        display: block;
        border-radius: 50%;
        border: 1px solid grey;
        position: absolute;
        top: -5px;
        left: -5px;
        width: 25px;
        height: 25px;
        text-align: center;
        line-height: 28px;
        transition-duration: 0.4s;
        transform: scale(0);
    }

    label img {
        height: 250px;
        width: 250px;
        transition-duration: 0.2s;
        transform-origin: 50% 50%;
    }

:checked + label {
    border-color: #ddd;
}

    :checked + label:before {
        content: "✓";
        background-color: grey;
        transform: scale(1);
    }

    :checked + label img {
        transform: scale(0.9);
        /* box-shadow: 0 0 5px #333; */
        z-index: 9999;
    }