<!-- Slideshow container -->
    <div class="slideshow-container">

        <!-- Full-width images with number and caption text -->
        <div class="mySlides fade">
            <div class="numbertext">第一張</div>
            <img src="https://www.w3schools.com/howto/img_nature_wide.jpg" style="width:49%">
            <img src="https://www.w3schools.com/howto/img_snow_wide.jpg" style="width:49%">
            <div class="text">雪山+高山</div>
        </div>

        <div class="mySlides fade">
            <div class="numbertext">第二張</div>
            <img src="https://www.w3schools.com/howto/img_snow_wide.jpg" style="width:100%">
            <div class="text">雪山</div>
        </div>

        <div class="mySlides fade">
            <div class="numbertext">第三張</div>
            <img src="https://www.w3schools.com/howto/img_lights_wide.jpg" style="width:100%">
            <div class="text">極光</div>
        </div>

        <!-- Next and previous buttons -->
        <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
        <a class="next" onclick="plusSlides(1)">&#10095;</a>
    </div>


    <!-- The dots/circles -->
    <div style="text-align:center">
        <span class="dot" onclick="currentSlide(1)"></span>
        <span class="dot" onclick="currentSlide(2)"></span>
        <span class="dot" onclick="currentSlide(3)"></span>
    </div>
    * {
        box-sizing: border-box
    }

    /* Slideshow container */
    .slideshow-container {
        max-width: 1000px;
        position: relative;
        margin: auto;
    }

    /* Hide the images by default */
    .mySlides {
        display: none;
    }

    /* Next & previous buttons */
    .prev,
    .next {
        cursor: pointer;
        position: absolute;
        top: 50%;
        width: auto;
        margin-top: -22px;
        padding: 16px;
        color: white;
        font-weight: bold;
        font-size: 18px;
        transition: 0.6s ease;
        border-radius: 0 3px 3px 0;
        user-select: none;
    }

    /* Position the "next button" to the right */
    .next {
        right: 0;
        border-radius: 3px 0 0 3px;
    }

    /* On hover, add a black background color with a little bit see-through */
    .prev:hover,
    .next:hover {
        background-color: rgba(0, 0, 0, 0.8);
    }

    /* Caption text */
    .text {
        color: #fff;
        font-size: 15px;
        padding: 8px 12px;
        position: absolute;
        bottom: 8px;
        width: 100%;
        text-align: center;
        background-color: ;
    }

    /* Number text (1/3 etc) */
    .numbertext {
        color: #f2f2f2;
        font-size: 12px;
        padding: 8px 12px;
        position: absolute;
        top: 0;
    }

    /* The dots/bullets/indicators */
    .dot {
        cursor: pointer;
        height: 15px;
        width: 15px;
        margin: 0 2px;
        background-color: #bbb;
        border-radius: 50%;
        display: inline-block;
        transition: background-color 0.6s ease;
    }

    .active,
    .dot:hover {
        background-color: #717171;
    }

    /* Fading animation */
    .fade {
        -webkit-animation-name: fade;
        -webkit-animation-duration: 1.5s;
        animation-name: fade;
        animation-duration: 1.5s;
    }

    @-webkit-keyframes fade {
        from {
            opacity: .4
        }

        to {
            opacity: 1
        }
    }

    @keyframes fade {
        from {
            opacity: .4
        }

        to {
            opacity: 1
        }
    }
   var slideIndex = 1;
    showSlides(slideIndex);

    // Next/previous controls
    function plusSlides(n) {
        showSlides(slideIndex += n);
    }

    // Thumbnail image controls
    function currentSlide(n) {
        showSlides(slideIndex = n);
    }

    function showSlides(n) {
        var i;
        var slides = document.getElementsByClassName("mySlides");
        var dots = document.getElementsByClassName("dot");
        if (n > slides.length) { slideIndex = 1 }
        if (n < 1) { slideIndex = slides.length }
        for (i = 0; i < slides.length; i++) {
            slides[i].style.display = "none";
        }
        for (i = 0; i < dots.length; i++) {
            dots[i].className = dots[i].className.replace(" active", "");
        }
        slides[slideIndex - 1].style.display = "block";
        dots[slideIndex - 1].className += " active";
    }

External CSS

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External JavaScript

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