Web implementation page bottom bar example

HTML part:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta  />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <link rel="stylesheet" href="./index.css" />
    Homepage>title<</title>
  </head>
  <body>
    <footer class="footer">
      <div class="item item-selected">
        <span class="icon footer-icon1"></span>
      </div>
      <div class="item">
        <span class="icon footer-icon2"></span>
      </div>
      <div class="item">
        <span class="icon footer-icon3"></span>
      </div>
      <div class="item">
        <span class="icon footer-icon4"></span>
      </div>
    </footer>
  </body>
</html>

CSS section:

html,
body {
  height: 100%;
  margin: 0; }

ul,
li {
  margin: 0;
  padding: 0; }

li {
  list-style: none; }

h1,
h2 {
  margin: 0; }

p {
  margin: 0;
  padding: 0; }

@media screen and (max-width: 768px) {
  html {
    font-size: 20px; } }

@media screen and (max-width: 320px) {
  html {
    font-size: 17.0666666667px; } }

.btn {
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer; }
  .btn:focus {
    outline: none; }

body {
  max-width: 768px;
  margin: 0 auto; }

.footer {
  max-width: 768px;
  height: 2.45rem;
  margin: 0 auto;
  box-sizing: border-box;
  background: #FFFFFF;
  border-top: 1px solid #E1E1E1;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 0 2.3rem;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 10; }
  .footer .item {
    text-align: center;
    font-size: 0.5rem;
    line-height: 0.7rem;
    color: #666666;
    padding-bottom: 0.175rem; }
    .footer .item-selected {
      color: #3492FD; }
    .footer .item:nth-child(1) .icon {
      background: url(./images/footer-icon1.png) no-repeat center/contain; }
    .footer .item:nth-child(2) .icon {
      background: url(./images/footer-icon2.png) no-repeat center/contain; }
    .footer .item:nth-child(3) .icon {
      background: url(./images/footer-icon3.png) no-repeat center/contain; }
    .footer .item:nth-child(4) .icon {
      background: url(./images/footer-icon4.png) no-repeat center/contain; }
    .footer .item:nth-child(1) .icon, .footer .item:nth-child(4) .icon {
      margin-bottom: 0.125rem; }
    .footer .item:nth-child(2) .icon {
      margin-bottom: 0.05rem; }
    .footer .item:nth-child(3) .icon {
      margin-bottom: 0.1rem; }
    .footer .item .icon {
      width: 1.2rem;
      height: 1.2rem;
      display: block; }

/*scss code is as follows:*/

/*html,
body {
  height: 100%;
  margin: 0;
}

ul,
li {
  margin: 0;
  padding: 0;
}
li {
  list-style: none;
}

h1,
h2 {
  margin: 0;
}

p {
  margin: 0;
  padding: 0;
}

// Browsers have their own default styles, the above part is to clear the browser default styles

@media screen and (max-width: 768px) {
  html {
    font-size: 20px;
  }
}

@media screen and (max-width: 320px) {
  html {
    font-size: 20px / 375 * 320;
  }
}

@function px2rem($px) {
  @return #{$px / 40}rem;
}

.btn {
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  &:focus {
    outline: none;
  }
}

$maxWidth: 768px;

body {
  max-width: $maxWidth;
  margin: 0 auto;
}

.footer {
  max-width: $maxWidth;
  height: px2rem(98);
  margin: 0 auto;
  box-sizing: border-box;
  background: #FFFFFF;
  border-top: 1px solid #E1E1E1;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 0 px2rem(92);

  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 10;

  .item {
    text-align: center;
    font-size: px2rem(20);
    line-height: px2rem(28);
    color: #666666;
    padding-bottom: px2rem(7);
    &-selected {
      color: #3492FD;
    }
    @for $i from 1 to 5 {
      &:nth-child(#{$i}) .icon {
        background: url(./images/footer-icon#{$i}.png) no-repeat center / contain;
      }
    }
    &:nth-child(1), &:nth-child(4){
      .icon {
        margin-bottom: px2rem(5);
      }
    }
    &:nth-child(2) .icon {
      margin-bottom: px2rem(2);
    }
    &:nth-child(3) .icon {
      margin-bottom: px2rem(4);
    }
    .icon {
      width: px2rem(48);
      height: px2rem(48);
      display: block;
    }
  }
}
*/

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