chrome-extensions-samples/samples/webview-samples/shared-script/app.css

webview,
.flex-item {
  flex-grow: 1;
  flex-shrink: 1;
}

.trim {
  margin: 0px;
  padding: 0px;
  border: 0px;
}

.padded {
  padding: 10px;
}

.full {
  width: 100%;
  height: 100%;
}

.flex-container {
  display: flex;
}

.row {
  flex-direction: row;
}

.column {
  flex-direction: column;
}

.left {
  text-align: left;
}

.right {
  text-align: right;
}