0 set the color of the four borders

<style type="text/css">
p.one
{
border-style: solid;
border-color: #0000ff
}
p.two
{
border-style: solid;
border-color: #ff0000 #0000ff
}
p.three
{
border-style:solid;
border-color: #ff0000 #00ff00 #0000ff
}
p.four
{
border-style: solid;
border-color: #ff0000 #0ff000 #0000ff rgb(250,0,255)
}
</style>

set the width of the bottom border

<style type= "text/css">
p
{
border-style: solid;
border-bottom-width: 15px
}
</style>