@fesjs/fes-design/es/input-number/style/index.css

fes-design for PC

.fes-input-number {
  position: relative;
  display: inline-block;
  width: 130px;
  -webkit-user-select: none;
     -moz-user-select: none;
          user-select: none;
}
.fes-input-number-actions {
  z-index: -1;
  display: flex;
  flex-direction: column;
  margin-right: -8px;
}
.fes-input-number-actions.fes-input-number-actions-suffix {
  margin-left: 8px;
}
.fes-input-number-actions:hover-increase,
.fes-input-number-actions:hover-decrease {
  border-color: var(transparent);
}
.fes-input-number-actions-increase,
.fes-input-number-actions-decrease {
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  width: 30px;
  height: 15px;
  color: var(--f-text-color-secondary);
  font-size: 13px;
  background-color: var(--f-component-bg-color);
  cursor: pointer;
}
.fes-input-number-actions-increase:hover,
.fes-input-number-actions-decrease:hover {
  z-index: 3;
  color: var(--f-primary-color);
  background-color: var(--f-hover-color-light);
  border-color: var(--f-primary-color);
}
.fes-input-number-actions-increase.is-disabled,
.fes-input-number-actions-decrease.is-disabled {
  color: var(--f-disabled-color-base);
  background-color: var(--f-component-bg-color);
  border-color: var(--f-border-color-disabled);
  cursor: not-allowed;
}
.fes-input-number-actions-increase {
  border-bottom: var(--f-border-width-base) var(--f-border-style-base) transparent;
  border-left: var(--f-border-base);
  border-radius: 0 var(--f-border-radius-base) 0 0;
}
.fes-input-number-actions-increase.is-disabled {
  border-bottom: 0;
}
.fes-input-number-actions-decrease {
  border-top: var(--f-border-base);
  border-left: var(--f-border-base);
  border-radius: 0 0 var(--f-border-radius-base) 0;
}