纯CSS实现弹出层

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html

css

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html

css

.modal-window {
  position: fixed;
  background-color: rgba(255, 255, 255, 0.25);
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 999;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s;
}
.modal-window:target {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}
.modal-window > div {
  width: 400px;
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  padding: 2em;
  background: #ffffff;
}
.modal-window header {
  font-weight: bold;
}
.modal-window h1 {
  font-size: 150%;
  margin: 0 0 15px;
}

.modal-close {
  color: #aaa;
  line-height: 50px;
  font-size: 80%;
  position: absolute;
  right: 0;
  text-align: center;
  top: 0;
  width: 70px;
  text-decoration: none;
}
.modal-close:hover {
  color: black;
}

/* Demo Styles */
html,
body {
  height: 100%;
}

body {
  font: 600 18px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  background-image: linear-gradient(to right, #7f53ac 0, #657ced 100%);
  color: black;
}

a {
  color: inherit;
}

.container {
  display: grid;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.modal-window div:not(:last-of-type) {
  margin-bottom: 15px;
}

small {
  color: #aaa;
}

.btn {
  background-color: #fff;
  padding: 1em 1.5em;
  border-radius: 3px;
  text-decoration: none;
}
.btn i {
  padding-right: 0.3em;
}

JavaScript

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