<label class="radikalwp-switch-grad"><input type="checkbox" class="radikalwp-switch-grad-input"><span class="radikalwp-switch-grad-track"><span class="radikalwp-switch-grad-knob"><//span><//span><//label>

.radikalwp-switch-grad-input { display: none; }
.radikalwp-switch-grad-track {
  display: block; width: 54px; height: 28px; border-radius: 99px; padding: 3px; cursor: pointer;
  background: #cbd5e1; transition: background .3s;
}
.radikalwp-switch-grad-knob {
  display: block; width: 22px; height: 22px; border-radius: 50%; background: #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,.2); transition: transform .3s cubic-bezier(.4,0,.2,1);
}
.radikalwp-switch-grad-input:checked + .radikalwp-switch-grad-track {
  background: linear-gradient(120deg, #8b5cf6, #ec4899);
}
.radikalwp-switch-grad-input:checked + .radikalwp-switch-grad-track .radikalwp-switch-grad-knob { transform: translateX(-26px); }