How to added the inside of Text Box in fa-fa eye Con.

Try below CSS

.password-input {
  padding-right: 30px; /* Space for the icon on the right */
}

.password-input::after {
  content: "\f06e"; /* Unicode for the Font Awesome eye icon (fa-eye) */
  font-family: 'FontAwesome';
  position: absolute;
  right: 10px; /* Adjust this value to position the icon as needed */
  top: 50%;
  transform: translateY(-50%);
  cursor: pointer;
}

.password-input[type="text"]::after {
  content: "\f070"; /* Unicode for the Font Awesome eye-slash icon (fa-eye-slash) for showing/hiding password */
}

Thanks