background-color Examples

Example 1
background : yellow background : #FFFF00
background : #FF0 background : rgb(255, 255, 0)
background : rgba(255, 255, 0, 0.3) background : rgba(255, 255, 0, 0.6)
<style type="text/css">
    .css_test_451 td {
        border-radius : 5px;
        border : 3px solid gray;
        height : 180px;
        text-align : center;
        width : 290px;
    }
    .css_test_451 td span {
        background : #fff;
        border-radius : 7px;
        border : 1px solid gray;
        display : inline-block;
        padding : 7px;
    }
</style>

<table class="css_test_451" cellpadding="0" cellspacing="7" align="center">
    <tr>
        <td style="background:yellow;"><span>background : yellow</span></td>
        <td style="background:#FFFF00;"><span>background : #FFFF00</span></td>
    </tr>
    <tr>
        <td style="background:#FF0;"><span>background : #FF0</span></td>
        <td style="background:rgb(255,255,0);"><span>background : rgb(255, 255, 0)</span></td>
    </tr>
    <tr>
        <td style="background:rgba(255,255,0,0.3);"><span>background : rgba(255, 255, 0, 0.3)</span></td>
        <td style="background:rgba(255,255,0,0.6);"><span>background : rgba(255, 255, 0, 0.6)</span></td>
    </tr>
</table>
Example 2
background-color
CSS background-color
background-color :
background-color : black
Example 3
background-color : rgba
CSS background-color
background-color :
255
255
255
0.7
background-color : rgba(255, 255, 255, 0.7)