<div class="card">
  <h1>farthest-corner</h1>
</div>

<div class="card">
  <h1>closest-side</h1>
</div>

<div class="card">
  <h1>closest-corner</h1>
</div>

<div class="card">
  <h1>farthest-side</h1>
</div>

body {
  display: grid;
  grid-gap: 30px;
  grid-template-columns: repeat(4, 200px);
  width: 100vw;
  height: 100vh;
  margin: 20px 0 0 20px;
  padding: 0;

  font: 14px/1.5 monospace;
}

h1 {
  font-size: inherit;
}

.card {
  width: 200px;
  height: 300px;
  padding: 30px;
  box-sizing: border-box;
  border-radius: 10px;
  
  color: #fff;
}

.card:nth-child(1) {
  background: radial-gradient(farthest-corner, #f44336, #000732);
}

.card:nth-child(2) {
  background: radial-gradient(closest-side, #f44336, #000732);
}

.card:nth-child(3) {
  background: radial-gradient(closest-corner, #f44336, #000732);
}

.card:nth-child(4) {
  background: radial-gradient(farthest-side, #f44336, #000732);
}