Search bar appears quite small on page

I have single page on my website with the search bar that can be viewed here (https://www.jessicacats.com/search). The problem is that the search bar is much smaller than I would like.

I’ve added the following Custom CSS to make sure the search bar fills the width of the page, but the search bar is still quite small and ideally, I’d love for it to be much larger in height. Please let me know what I need to do in order to make the search bar larger on the page.

.is-form-id-2082 input.is-search-input {
padding: 0.6rem 1rem;
}
form.is-form-id-657 input.is-search-input {
font-size: 20px !important;
}
.is-form-id-2082 label {
width: 180px;
}
#signin textarea {
resize: none;
}
@media (max-width: 768px){
.secondary-navigation li.menu-item-type-gs_sim {
display: none;
}
}