How to give Vertical align - middle for Div Element?

HTML:
<div class="myAlign"> Sample Content Here</div>


CSS:
.myAlign{
height: 300px;
display: table-cell;
vertical-align: middle
}

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How to give 100% Background Image with CSS?

CSS Style:

.mybox{
    background-image:url("images/sample-image.jpg");
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

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How to give or apply css to Ordered list Numbers

HTML Ordered List:

<ol class="mylist">
              <li>Fist list item</li>
              <li>Second list item</li>
              <li>Third list item</li>
              <li>Fourth list item</li>
              <li>Fifth list item</li>
              <li>Sixth list item</li>
              <li>Seventh list item</li>
</ol>

CSS Styles: