src/components/graph/plugins/controls/styles.css
.solid-flow {
  --xy-controls-button-background-color-default: #fefefe;
  --xy-controls-button-background-color-hover-default: #f4f4f4;
  --xy-controls-button-color-default: inherit;
  --xy-controls-button-color-hover-default: inherit;
  --xy-controls-button-border-color-default: #eee;
  --xy-controls-box-shadow-default: 0 0 2px 1px rgba(0, 0, 0, 0.08);
}

.solid-flow.dark {
  --xy-controls-button-background-color-default: #2b2b2b;
  --xy-controls-button-background-color-hover-default: #3e3e3e;
  --xy-controls-button-color-default: #f8f8f8;
  --xy-controls-button-color-hover-default: #fff;
  --xy-controls-button-border-color-default: #5b5b5b;
  --xy-controls-box-shadow-default: 0 0 2px 1px rgba(0, 0, 0, 0.08);
}

.solid-flow__controls {
  display: flex;
  flex-direction: column;
  box-shadow: var(--xy-controls-box-shadow, var(--xy-controls-box-shadow-default));

  &.horizontal {
    flex-direction: row;
  }

  button {
    cursor: pointer;
    user-select: none;
    border: none;

    display: flex;
    justify-content: center;
    align-items: center;
    height: 26px;
    width: 26px;
    padding: 4px;

    background: var(
      --xy-controls-button-background-color,
      var(--xy-controls-button-background-color-default)
    );
    border-bottom: 1px solid
      var(
        --xy-controls-button-border-color-props,
        var(--xy-controls-button-border-color, var(--xy-controls-button-border-color-default))
      );
    color: var(
      --xy-controls-button-color-props,
      var(--xy-controls-button-color, var(--xy-controls-button-color-default))
    );

    &:hover {
      background: var(
        --xy-controls-button-background-color-hover-props,
        var(
          --xy-controls-button-background-color-hover,
          var(--xy-controls-button-background-color-hover-default)
        )
      );
      color: var(
        --xy-controls-button-color-hover-props,
        var(--xy-controls-button-color-hover, var(--xy-controls-button-color-hover-default))
      );
    }

    &:disabled {
      pointer-events: none;

      svg {
        fill-opacity: 0.4;
      }
    }

    svg {
      width: 100%;
      max-width: 12px;
      max-height: 12px;
      fill: currentColor;
    }
  }

  button:last-child {
    border-bottom: none;
  }
}
