Removing aspect-ratio and using padding-top: 56.25%; instead

Question

All I am doing is replacing aspect-ratio: 1; with, padding-top: 56.25%; in the code.

:root {
  --color-a: #1155cc;
  --color-b: black;
  --color-c: #1155cc;
  --color-d: black;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: #121212;
  padding: 50px 8px;
}

.panel-left,
.panel-right {
  position: fixed;
  height: 100%;
  width: 50%;
  top: 0%;
  overflow: hidden;
  z-index: 0;
  transform: translateX(0);
  transition: transform 3s cubic-bezier(0.645, 0.045, 0.355, 1);
  transition-delay: 1s;
}

.panel-left {
  left: 0;
}

.panel-right {
  right: 0;
}

.panel-left::before,
.panel-right::before {
  content: "";
  position: fixed;
  height: 100%;
  width: 200%;
  top: 0;
  left: 0;
  background: black;
}

.panel-right::before {
  left: -100%;
}

body:hover .panel-left {
  transform: translateX(-100%);
}

body:hover .panel-right {
  transform: translateX(100%);
}
.inner {
  height: 100%;
  width: 200%;
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin: auto;
}

.panel-right .inner {
  left: -100%;
}

.inner span,
.inner span:before,
.inner span:after,
.inner:before,
.inner:after {
  aspect-ratio: 1;
  margin: auto;
  height: 100%;
}

.inner:before {
  content: "";
  background: url();
}

.inner:after {
  content: "";
  background: url();
}

.inner span {
  background: url();
  position: relative;
}

.inner span:before,
.inner span:after {
  content: "";
  display: block;
  position: absolute;
  inset: 0 0 0 0;
}

.inner span:before {
  background: url();
  transform: translateX(-99.99%);
}

.inner span:after {
  background: url();
  transform: translateX(99.99%);
}

.inner span,
.inner span:before,
.inner span:after,
.inner:before,
.inner:after {
  background-size: cover;
}

<div class="panel-left">
  <div class="inner"><span></span></div>
</div>

<div class="panel-right">
  <div class="inner"><span></span></div>
</div>