Hide element on form registration

[MyaDB]

Hi,

Please can you help me to hide anelement on my form registration

the code is like this, how i can hide it

<input type="text" placeholder="Prénom" required="" value="" name="firstname" class="form-control">

i have prestashop 1.7.7.3

 

thanks

[nawres]

For fast solution : you can set default value for this

<input type="text" placeholder="Prénom" required="" value="xxxx" name="firstname" class="form-control">

and after display  none this input on css file (assets/custom.css) :

.row .firstname {

display: none !important;

}

it works on my case