如何使一个纯的css三角形有一个白色的中心 [英] How to make a pure css triangle which has a white center
问题描述
我要使用css创建一个向上和向下的箭头,如下所示: http:/ /apps.eky.hk/css-triangle-generator/
I want to create an upward and downward facing arrow with css like the following: http://apps.eky.hk/css-triangle-generator/
但是,我不想使用纯色,而是将其设置为白色和三角形周围只有一个边框。 (因此,三角形将是多色的,一种颜色在内部和不同的彩色边框)。
However, instead of a solid color, I want to set it up so the inside is white and there is just a border around the triangle. (So the triangle would be multi-colored, one color on the inside and a different colored border).
这是可能的,如果是这样,
Is this possible, and if so, how can it be done?
推荐答案
要使用CSS创建三角形,我们使用带边框的零宽度/高度元素:
To create triangles with only CSS we use a zero width/height element with borders:
.arrow-up {
width : 0;
height : 0;
border-left : 50px solid transparent;
border-right : 50px solid transparent;
border-bottom : 50px solid black;
}
由于我们使用边框创建箭头,它是一个边框,但我们可以在一个稍大的箭头顶部叠加一个箭头,以使边框的外观:
Since we are using borders to create the arrow, we can't just give it a border, but we can overlay one arrow on top of a slightly larger arrow to make the appearance of a border:
HTML -
<div class="top"></div>
<div class="bottom"></div>
-
CSS --
.top {
position : absolute;
top : 6px;
left : 10px;
width : 0;
height : 0;
z-index : 100;
border-left : 50px solid transparent;
border-right : 50px solid transparent;
border-bottom : 50px solid black;
}
.bottom {
position : absolute;
width : 0;
height : 0;
z-index : 99;
border-left : 60px solid transparent;
border-right : 60px solid transparent;
border-bottom : 60px solid red;
}
这是一个演示: http://jsfiddle.net/jasper/qnmpb/1/
然后,您可以将两个三角形DIV元素放在容器中,并移动该容器:
You can then put both of the triangle DIV elements inside a container and move that container however you want:
HTML -
<div id="container">
<div class="top"></div>
<div class="bottom"></div>
</div>
CSS -
#container {
position : relative;
top : 25px;
left : 25px;
}
这里是一个演示: http://jsfiddle.net/jasper/qnmpb/3/
我刚才回到这个答案,注意到创建双三角形时不需要单独的HTML元素。您可以使用伪元素:之前
和:之后
。也就是说将 .top
选择器替换为 .my-element-that-needs-a-triangle:before
.bottom
选择器与 .my-element-that-needs-a-triangle:after
之后。
I just came back to this answer and noticed that separate HTML elements are not necessary to create your double-triangle. You can use pseudo-elements, :before
and :after
. I.e. replace the .top
selector with something like .my-element-that-needs-a-triangle:before
and the .bottom
selector with something like .my-element-that-needs-a-triangle:after
.
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