how to change only one word in web code example

Example 1: html css text style on a word

<p style="font-size:14px; color:#538b01; font-weight:bold; font-style:italic;">
  Enter the competition by 
  <span style="color: #ff0000">January 30, 2011</span>
  and you could win up to $$$$ — including amazing 
  <span style="color: #0000a0">summer</span> 
  trips!
</p>

Example 2: html css text style on a word

p {
    font-size:14px;
    color:#538b01;
    font-weight:bold;
    font-style:italic;
}

mark.red {
    color:#ff0000;
    background: none;
}

mark.blue {
    color:#0000A0;
    background: none;
}