【CSS】How to implement text that changes color even within a single character and supports liquid layout（Demo page）

body {
  background: #cacaca;
}

.wrap {
  max-width: 900px;
  width: 100%;
  height: 500px;
  margin: 200px auto 0;
  word-break: break-all;
}

.main {
  position: relative;
  width: 100%;
  height: 100%
}

.inner {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  font-size: 53px;
}

.main .trim-title {
  position: absolute;
  top: 50px;
  right: 0;
  width: 88%;
  height: 4em;
  line-height: 1.5;
}

.trim-title span {
  display: block;
  position: absolute;
  left: -12%;
}

.main .trim-title span {
  top: 0;
  height: 100%;
  color: #000;
}

.trim-front {
  z-index: 3;
}

.trim-back {
  z-index: 1;
}

.trim-title.front span {
  color: #ffffff;
}

.trim-title.front {
  overflow: hidden;
}

@media screen and (max-width:640px){
  .wrap {
    max-width: 95%;
    margin: 0 auto;
    height: 150px;
  }
  .inner {
    font-size: 20px;
  }
}