html5 - Div auto expand width right column -

Looking at the following HTML, I want the second div to appear on the right side of the red box of a certain size, What is the full width I am missing?

  & lt; Html xmlns = "http://www.w3.org/1999/xhtml" & gt; & Lt; Head runat = "server" & gt; & Lt; Title & gt; & Lt; / Title & gt; & Lt; / Head & gt; & Lt; Body & gt; & Lt; Form id = "form1" runat = "server" & gt; & Lt; Div style = "width: 100%;" & Gt; & Lt; Div style = "width: 300px; height: 300px; border: 1px solid red; float: left; clear: both; background color: red;" & Gt; & Lt; / Div & gt; & Lt; Div style = "border: 1 px solid red; float: left; background-color: blue; color: white;" & Gt; "We tell about our work that they are ready to work, but for their work, they have to work just before work. Extreme ID / Library / Lt; / div & gt;