Question

I am trying to make an arrow overlap onto the div below it (the way the gray arrow overlaps onto the red on http://tinyletter.com).

这里是我目前正在使用的法典:

#box_1 {
height: 550px;
width: 100%;
font-size: 4.5em;
font-weight: 600;
float: center;
text-align: center;
background-color: #ededed;
padding: 55px 0 0 0;
}

.arrow-down {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-top: 50px solid #ededed;
margin-left:auto;
margin-right:auto;
}

#box_2 {
height: 600px;
width: 100%;
font-size: 7em;
float: center;
text-align: center;
background-color: #ed2227;
}

Answer 1

如果您能够依靠<代码>的使用:<> > > > 之后/代码>(或:>) pseudo-elements,那么使用<代码> 越境就比较容易:

#top {
    position: relative;
    background-color: #ccc;
}

#top::after {
    position: absolute;
    content:   ;
    top: 100%;
    left: 50%;
    margin: 0 0 0 -1em;
    border: 1em solid transparent;
    border-top: 1em solid #ccc;
}

JS Fiddle demo.

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