详解css样式之border属性

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 p {
    height: 20px;
    width: 20px;
    border-color: #FF9600 #3366ff #12ad2a #f0ed7a;
    border-style: solid;
    border-width: 20px;
}

 p {    
    width: 0px;
    height: 0px;
    border-color: #FF9600 #3366ff #12ad2a #f0ed7a;
    border-style: solid;
    border-width: 20px;
}

 p {    
    width: 0px;
    height: 0px;
    border-color: lightblue transparent trnasparent transparent;
    border-style: solid;
    border-width: 20px;
}

 p {    
    width: 0px;
    height: 0px;
    border-color: transparent trnasparent pink;
    border-style: solid;
    border-width: 20px;
}

 p {    
    width: 0px;
    height: 0px;
    border-color: transparent gray trnasparent transparent;
    border-style: solid;
    border-width: 20px;
}

 p {    
    width: 0px;
    height: 0px;
    border-color: transparent transparent trnasparent lightgreen;
    border-style: solid;
    border-width: 20px;
}