<div class="radikalwp-form-float"><input class="radikalwp-form-float-input" type="email" id="radikalwp-float-email" placeholder=" " required><label class="radikalwp-form-float-label" for="radikalwp-float-email">ایمیل شما<//label><//div>

.radikalwp-form-float {
  position: relative;
  max-width: 320px;
}
.radikalwp-form-float-input {
  width: 100%;
  padding: 22px 16px 8px;
  font-family: inherit;
  font-size: 14px;
  color: #1e293b;
  background: #fff;
  border: 1.5px solid #e2e8f0;
  border-radius: 12px;
  outline: none;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.radikalwp-form-float-input:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, .14);
}
.radikalwp-form-float-label {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  color: #94a3b8;
  pointer-events: none;
  transition: all .2s ease;
}
.radikalwp-form-float-input:focus + .radikalwp-form-float-label,
.radikalwp-form-float-input:not(:placeholder-shown) + .radikalwp-form-float-label {
  top: 12px;
  transform: none;
  font-size: 11px;
  color: #6366f1;
  font-weight: 700;
}