root {
  --f-button-width: 40px;
  --f-button-height: 40px;
  --f-button-border: 0;
  --f-button-border-radius: 0;
  --f-button-color: #374151;
  --f-button-bg: #f8f8f8;
  --f-button-hover-bg: #e0e0e0;
  --f-button-active-bg: #d0d0d0;
  --f-button-shadow: none;
  --f-button-transition: all 0.15s ease;
  --f-button-transform: none;
  --f-button-svg-width: 20px;
  --f-button-svg-height: 20px;
  --f-button-svg-stroke-width: 1.5;
  --f-button-svg-fill: none;
  --f-button-svg-filter: none;
  --f-button-svg-disabled-opacity: 0.65
}