html - 放大此图像但仍使其居中？

Question

这是迄今为止的图像：

我是 html 的新手（本学期开始），刚开始为 AIT 项目/学校分配。我正在一个模仿电脑商店的网站上工作。我正在尝试模拟 PLE 计算机。因此，我创建了自己的小幻灯片图像（我没有编写幻灯片代码，只是通过 Photoshop 制作了图像）。但是，我从 w3schools 复制的代码只有较小的尺寸，我希望它要么填满整个屏幕，要么至少更大。虽然当我改变图像的宽度时，它会向右移动并离开屏幕：

演示当我将宽度从 100% 更改为 200% 时会发生什么：

这是我用于幻灯片的代码：HTML：

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

          <!-- Full-width images with number and caption text -->
          <div class="mySlides fade">
            <div class="numbertext">1 / 3</div>
            <a href="gaming.html"/><img src="easter.png" style="width:100%">
            <div class="text">T&Cs Apply</div>
          </div>

          <div class="mySlides fade">
            <div class="numbertext">2 / 3</div>
            <img src="easter.jpg" style="width:100%">
            <div class="text">T&Cs Apply</div>
          </div>

          <div class="mySlides fade">
            <div class="numbertext">3 / 3</div>
            <img src="whiteout.png" style="width:100%">
            <div class="text">T&Cs Apply</div>
          </div>

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

        <!-- 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>

<!--
        <script>
        var slideIndex = 1;
        showSlides(slideIndex);

        function plusSlides(n) {
          showSlides(slideIndex += n);
        }

        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";
        }
        </script>
-->

        <script>
        var slideIndex = 0;
        showSlides();

        function showSlides() {
          var i;
          var slides = document.getElementsByClassName("mySlides");
          var dots = document.getElementsByClassName("dot");
          for (i = 0; i < slides.length; i++) {
            slides[i].style.display = "none";
          }
          slideIndex++;
          if (slideIndex > slides.length) {slideIndex = 1}
          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";
          setTimeout(showSlides, 4000); // Change image every 2 seconds
        }
        </script>

CSS：

* {box-sizing:border-box}

/* Slideshow container */
.slideshow-container {
  max-width: 900px;
  position: relative;
  margin: auto;
  margin-top: 100px;
}

/* Hide the images by default */
.mySlides {
  display: none;
  text-align: center;
}



/* 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: -22px;
  transform: translate(0,-170%);
  border-radius: 3px 0 0 3px;
}

.prev{
  left: -22px;
  transform: translate(0,-170%);
}

/* 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: #f2f2f2;
  font-size: 15px;
  padding: 8px 12px;
  position: absolute;
  bottom: 8px;
  width: 100%;
  text-align: center;
}

/* Number text (1/3 etc) */
.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
  opacity: 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;
  transform: translate(0,-40%);
}

.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}
}

标签： htmlcss