code-server/src/browser/pages/global.css

html,
body,
#root,
.center-container {
  height: 100%;
  width: 100%;
}

body {
  background: #272727;
  color: #f4f4f4;
  margin: 0;
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif,
    "Apple Color Emoji",
    "Segoe UI Emoji",
    "Segoe UI Symbol";
  overflow: hidden;
}

button {
  font-family: inherit;
}

.center-container {
  align-items: center;
  box-sizing: border-box;
  display: flex;
  justify-content: center;
  padding: 20px;
}