I want to change color within the value text shown in the text area. such as shown in the image

I want to change color within the value shown in the text area. such as shown in the image.

<textarea id="pageTitle" name="pageTitle"  rows="5" class="form-control" >{{ "Buy ".$genericbrandData->genericBrand." ".$imporvised_genericStrength. " online- Generic ".$genericbrandData->genericName."- ".$genericbrandData->genericCompany }} </textarea>


output is shown here

What I want

Source: Laravel 5 Questions