主要是 CSS

<style>
    .overlay {
        visibility: hidden;
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        background: rgba(0, 0, 0, .4);
        transition: opacity .3s;
        opacity: 0;
    }
    .overlay:target {
        visibility: visible;
        opacity: 1;
    }
    .modal {
        position: relative;
        width: 500px;
        max-width: 80%;
        background: white;
        border-radius: 4px;
        padding: 2.5em;
        box-shadow: 0 5px 11px rgba(36, 37, 38, 0.08);
    }
    .modal .close {
        position: absolute;
        top: 15px;
        right: 15px;
        color: grey;
        text-decoration: none;
    }
    .overlay .cancel {
        position: absolute;
        width: 100%;
        height: 100%;
    }
</style>







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