Does UL have default margin or padding [duplicate]

This might seem like a dumb question, but I've added an UL to a basic page and the list seems to be off-centered. There's nothing special about the list. No specific css added: just a list. When I load live it's slightly off center.
Is there a default margin or padding on the left side?

<h3>Title Heading</h3>
   <ul id="listItems">
       <li>itemOne</li>
       <li>itemTwo</li>
       <li>itemThree</li>
   </ul>

The main body has all the css code for centering, aligning, float, etc. The 'Title Header' align perfectly. Just list is a little off.

Thank you.

Oh, don't know if this is important, but I added the 'id' cause... wanted to use 'first-of-type' to give 1st item em(bold).

The problem is that by default, browsers have custom css - in chrome for example:

ul, menu, dir {
   display: block;
   list-style-type: disc;
   -webkit-margin-before: 1em;
   -webkit-margin-after: 1em;
   -webkit-margin-start: 0px;
   -webkit-margin-end: 0px;
   -webkit-padding-start: 40px;
}

You'll have to use a custom rule for your ul:

element.style {
    margin-left: 0px;
    /* set to 0 if your not using a list-style-type */
    padding-left: 20px;
}

Lists will always align so the text remains in line with the edge of the parent element. This means the bullet points will by default sit outside (to the left) of the element. You can force the alignment to happen to the bullet point, not the text like so:

ul {
  list-style-position: inside; }

Alternatively you can just add your own margin to push the entire list element like so:

ul {
  margin-left: 20px; }