css3实现小箭头各种图形效果

#triangle-up{
	display:inline-block;
	width:0;
	height:0;
	border-left:30px solid transparent;
	border-right: 30px solid transparent;
	border-bottom:50px solid red;}
#triangle-down {
	display:inline-block;
	width:0;
	height:0;
	border-left:30px solid transparent;
	border-right: 30px solid transparent;
	border-top:50px solid red;}
#triangle-left {
	display:inline-block;
	width:0;
	height:0;
	border-top: 30px solid transparent;
	border-right: 50px solid red;
	border-bottom: 30px solid transparent;}
#triangle-right{
	display:inline-block;
	width:0;
	height:0;
	border-top: 30px solid transparent;
	border-left: 50px solid red;
	border-bottom: 30px solid transparent;}

#triangle-topleft {
    display:inline-block;
    width: 0;
    height: 0;
    border-top: 50px solid red;
    border-right: 50px solid transparent;
}
#triangle-topright {
    display:inline-block;
    width: 0;
    height: 0;
    border-top: 50px solid red;
    border-left: 50px solid transparent;
}
#triangle-bottomleft {
    display:inline-block;
    width: 0;
    height: 0;
    border-bottom: 50px solid red;
    border-right: 50px solid transparent;
}
#triangle-bottomright {
    display:inline-block;
    width: 0;
    height: 0;
    border-bottom: 50px solid red;
    border-left: 50px solid transparent;
}

#heart {
    position: relative;
    width: 100px;
    height: 90px;
}
#heart:before,
#heart:after {
    position: absolute;
    content: "";
    left: 50px;
    top: 0;
    width: 50px;
    height: 80px;
    background: red;
    -moz-border-radius: 50px 50px 0 0;
    border-radius: 50px 50px 0 0;
    -webkit-transform: rotate(-45deg);
       -moz-transform: rotate(-45deg);
        -ms-transform: rotate(-45deg);
         -o-transform: rotate(-45deg);
            transform: rotate(-45deg);
    -webkit-transform-origin: 0 100%;
       -moz-transform-origin: 0 100%;
        -ms-transform-origin: 0 100%;
         -o-transform-origin: 0 100%;
            transform-origin: 0 100%;
}
#heart:after {
    left: 0;
    -webkit-transform: rotate(45deg);
       -moz-transform: rotate(45deg);
        -ms-transform: rotate(45deg);
         -o-transform: rotate(45deg);
            transform: rotate(45deg);
    -webkit-transform-origin: 100% 100%;
       -moz-transform-origin: 100% 100%;
        -ms-transform-origin: 100% 100%;
         -o-transform-origin: 100% 100%;
            transform-origin :100% 100%;
}