css - Using percentage values with background-position on a linear-gradient

Question

Is there any way to make background-position take percentage values? Currently my button only works with an explicit values for width and background-position.

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
}

.button {
  display: flex;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  color: white;
  font-weight: bold;
  width: 350px;
  height: 50px;
  border: 1px solid green;
  transition: background 0.5s;
  background-repeat: no-repeat;
  background-image: linear-gradient(to left, #2484c6, #1995c8 51%, #00bbce), linear-gradient(to right, #2484c6 0%, #1995c8 51%, #00bbce 76%);
}
.button-pixel {
  background-position: -350px 0px, 0px 0px;
}
.button-pixel:hover {
  background-position: 0px 0px, 350px 0px;
}
.button-percentage {
  background-position: -100% 0px, 0px 0px;
}
.button-percentage:hover {
  background-position: 0% 0px, 100% 0px;
}

<a href="#" class="button button-pixel">In Pixel</a>
<a href="#" class="button button-percentage">In Percentage</a>

Answer 1

TL;DR

All the percentage values used with background-position are equivalent when using a gradient as background, so you won't see any difference. You need to specify a background-size different from the container size:

body {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
  min-height:90vh;
}

.button {
  text-decoration: none;
  color: white;
  font-weight: bold;
  width: 350px;
  height: 50px;
  text-align:center;
  transition: background 0.5s;
  background-repeat: no-repeat;
  background-image: 
    linear-gradient(to left, #2484c6, #1995c8 51%, #00bbce), 
    linear-gradient(to right, #2484c6 0%, #1995c8 51%, #00bbce 76%);
  background-size:200% 100%; /*Changed this*/
}
.button-pixel {
  background-position: -350px 0px, 0px 0px;
}
.button-pixel:hover {
  background-position: 0px 0px, 350px 0px;
}
.button-percentage {
  background-position: 100% 0px, 0px 0px;
}
.button-percentage:hover {
  background-position: 0% 0px, 100% 0px;
}

<a href="#" class="button button-pixel">Pixel</a>
<a href="#" class="button button-percentage">Percentage</a>