Resizing a button

If you want to call a different size for the button inline, you would probably do it like this:

<div class="button" style="width:60px;height:100px;">This is a button</div>

Or, a better way to have different sizes (say there will be 3 standard sizes for the button) would be to have classes just for size.

For example, you would call your button like this:

<div class="button small">This is a button</div>

And in your CSS

.button.small { width: 60px; height: 100px; }

and just create classes for each size you wish to have. That way you still have the perks of using a stylesheet in case say, you want to change the size of all the small buttons at once.

Another alternative is that you are allowed to have multiple classes in a tag. Consider:

 <div class="button big">This is a big button</div>
 <div class="button small">This is a small button</div>

And the CSS:

 .button {
     /* all your common button styles */
 }

 .big {
     height: 60px;
     width: 100px;
 }
 .small {
     height: 40px;
     width: 70px;
 }

and so on.

You should not use "width" and "height" attributes directly, use the style attribute like style="some css here" if you want to use inline styling:

<div class="button" style="width:60px;height:30px;">This is a button</div>

Note, however, that inline styling should generally be avoided since it makes maintenance and style updates a nightmare. Personally, if I had a button styling like yours but also wanted to apply different sizes, I would work with multiple css classes for sizing, like this:

   .button {
        background-color: #000000;
        color: #FFFFFF;
        padding: 10px;
        border-radius: 10px;
        -moz-border-radius: 10px;
        -webkit-border-radius: 10px;
        margin:10px
    }
    
    .small-btn {
        width: 50px;
        height: 25px;
    }
    
    .medium-btn {
        width: 70px;
        height: 30px;
    }
    
    .big-btn {
        width: 90px;
        height: 40px;
    }

    <div class="button big-btn">This is a big button</div>
    <div class="button medium-btn">This is a medium button</div>
    <div class="button small-btn">This is a small button</div>
 

jsFiddle example

Using this way of defining styles removes all style information from your HTML markup, which in will make it easier down the road if you want to change the size of all small buttons - you'll only have to change them once in the CSS.