It seems the fixed height causes issues with some things like PayPal Donate Buttons.
I had to change from: (index.css)
/* Declarations for inputs, selects and buttons */
input, .input_text, button, select {
padding: 0 6px;
min-height: 2em;
max-height: 2em;
height: 2em;
vertical-align: middle;
}
To:
/* Declarations for inputs, selects and buttons */
input, .input_text, button, select {
padding: 0 6px;
min-height: 2em;
/* max-height: 2em;
height: 2em; */
vertical-align: middle;
}
In order not to have a very tiny Donate Button.
However, after doing so, did not notice any other inputs being negatively affected.