<p class="one">Theo tên Màu</p>
<p class="two">HEX</p>
<p class="three">RBG</p>
<p class="four">HLS</p>
<p class="five">Trong suốt</p>
p.one {

  border-style: solid;

  border-color: red;

}

p.two {

  border-style: solid;

  border-color:  #fff000;

}

p.three {

  border-style: solid;

  border-color: rgb(40, 28, 95);

}

p.four {

  border-style: solid;

  border-color: hsl(0,50%,70%);

}

p.five {

  border-style: solid;

  border-color: transparent;

}

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External JavaScript

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