Adjusting the width of a button can result in gaps forming between neighboring buttons

I am currently working on a calculator project that involves customizing the width of a specific button with the ID equal. However, when I adjust the width of this button, it results in unexpected spacing between the third and fourth buttons in each row, consequently altering the overall table layout as well. Below is the excerpt of my HTML and CSS code:

table {

border: 1px solid rgb(180, 172, 172); 
background-color: aliceblue;
margin-left: auto; 
margin-right: auto; 
border-spacing: 6px;
border-radius: 1rem;
outline: none;
-webkit-box-shadow:0px 10px 39px 10px rgba(62,66,66,0.22);
-moz-box-shadow: 0px 10px 39px 10px rgba(62,66,66,0.22);
 box-shadow: 0px 10px 39px 10px rgba(62,66,66,0.22);
 } 
 #result {
margin-top: 5px;
height: 11vh;
width: 350px;
background-color: #E8E8E8;
border: 1px solid #E8E8E8;
border-radius: 5rem;  
 }
input[type="button"] { 
width: 60px;
height:9vh; 
background-color: #E8E8E8;; 
color: white; 
font-size: 24px; 
font-weight: bold; 
border: none; 
border-radius: 5rem; 
} 
#equal {
width: 140px!important;
}
<table id="calc"> 
    <tr>
        <td colspan="4"><input type="text" id="result"></td>
    </tr>
    <tr>
        <td><input type="button" id="AC"></td>
        <td><input type="button" id="C"></td>
        <td><input type="button" id="%"></td>
        <td><input type="button" id="/"></td>
    </tr>
    <tr>
        <td><input type="button" id="7"></td>
        <td><input type="button" id="8"></td>
        <td><input type="button" id="9"></td>
        <td><input type="button" id="x"></td>
    </tr>
    <tr>
        <td><input type="button" id="4"></td>
        <td><input type="button" id="5"></td>
        <td><input type="button" id="6"></td>
        <td><input type="button" id="-"></td>
    </tr>
    <tr>
        <td><input type="button" id="1"></td>
        <td><input type="button" id="2"></td>
        <td><input type="button" id="3"></td>
        <td><input type="button" id="+"></td>
    </tr>
    <tr>
        <td><input type="button" id="0"></td>
        <td><input type="button" id="."></td>
        <td><input type="button" id="equal"></td>
    </tr>
</table>

In an attempt to work around this issue, I decided to remove the width property and experiment with padding instead. Unfortunately, this led to unintended changes in the button widths at the top of the calculator.

Answer №1

Your table currently has 4 columns, but the last row only has 3 columns. Simply add a colspan=2 attribute to your last td tag.

Instead of:

<td><input type="button" id="equal"></td>

Use:

<td colspan=2><input type="button" id="equal"></td>

With this modification, your code should work correctly.

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