How to adjust the Caret (blinking cursor) size inside searchbar with css

You cannot change the width of the caret (at least for now);
But you can change the caret color for majority of modern browsers

https://developer.mozilla.org/en-US/docs/Web/CSS/caret-color

input {
 caret-color: red;
 caret-color: #ff0000;
 caret-color: rgb(255, 0, 0);
 caret-color: hsl(0, 97%, 50%);
}