Check out example codes for "how to increase size of input submit type in html". It will help you in understanding the concepts better.

Code Example 1

<button style="height:40px; width=40px;">Press Me</button>

Code Example 2

input[type=submit] {
    width: 20em;  height: 2em;
}

Code Example 3

#search {
    width: 20em;  height: 2em;
}

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