纯CSS跟随滑块

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html

css

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html

css

html,
body {
  height: 100%;
}

body {
  padding: 0;
  margin: 0;
  background: #222;
  color: #fff;
}

input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.wrapper {
  position: absolute;
  padding-bottom: 1.25em;
  width: 100%;
  max-width: 52rem;
  margin: 8rem 0 5rem;
  left: 50%;
  -webkit-transform: translateX(-50%);
          transform: translateX(-50%);
  font-size: 0;
}

label {
  position: relative;
  display: inline-block;
  cursor: pointer;
  width: 140px;
  height: 50px;
  margin-right: 10px;
  line-height: 50px;
  text-align: center;
  font-family: "Courier New", Courier, monospace;
  font-size: 17px;
}

.opt-3 + label {
  width: 300px;
}

/* background-size and backround-position on :checked is only needed if using gradients instead of solid backgrounds  */
.tracker {
  height: 2px;
  width: 140px;
  background: -webkit-linear-gradient(left, limegreen, skyblue, darkorchid, hotpink, aqua);
  background: linear-gradient(to right, limegreen, skyblue, darkorchid, hotpink, aqua);
  background-size: 400%;
  position: absolute;
  -webkit-transition: all 270ms ease-in-out, width 270ms ease-in-out;
  transition: all 270ms ease-in-out, width 270ms ease-in-out;
}

.opt-2:checked ~ .tracker {
  -webkit-transform: translateX(0);
          transform: translateX(0);
}

.opt-2:checked ~ .tracker {
  background-position: 25%;
  -webkit-transform: translateX(150px);
          transform: translateX(150px);
}

.opt-3:checked ~ .tracker {
  width: 300px;
  background-position: 60%;
  -webkit-transform: translateX(300px);
          transform: translateX(300px);
}

.opt-4:checked ~ .tracker {
  background-position: 90%;
  -webkit-transform: translateX(600px);
          transform: translateX(600px);
}

@media screen and (max-width: 770px) {
  .opt-4,
  .opt-4 + label {
    display: none;
  }
}

JavaScript

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