主要div元素只有顶部，底部和左侧边框。右边框被取消，因为元素及其箭头需要透明。使用透明箭头，如果存在右边框，也会显示该边框。 使用skew相对于形状右边缘放置的ed元素可实现右侧的箭头。 通过使用另一个伪元素来实现形状的右边界，该伪元素的大小与整个容器的高度相同-箭头伪元素的高度。此元素相对于形状的右下角定位。 您可以根据需要调整高度和边界半径。我已将 位置设置为即使父母的身高/宽度也不会受到影响
div.shape {
position: relative;
width: 300px;
height: 100px;
padding: 4px;
margin-top: 20px;
border: 2px solid gray;
border-right: none; /* not required as the shape needs to be transparent */
border-radius: 8px; /* not required as the right border is done through pseudo element */
border-top-right-radius: 0px;
border-bottom-right-radius: 0px;
}
div.shape:before {
position: absolute;
content: '';
top: -2px; /* equal to border top of parent - no need to change*/
right: -6px; /* for positioning - no need to change*/
height: 15%; /* should be changed depending on height of arrow */
width: 10%; /* should be changed depending on width of arrow */
border-top: 2px solid gray;
border-right: 3px solid gray; /* thicker border because skew makes it thin */
/* to achieve the arrow like shape */
-webkit-transform-origin: bottom right;
-webkit-transform: skew(-45deg);
-moz-transform: skew(-45deg);
transform: skew(-45deg);
}
div.shape:after {
position: absolute;
content: '';
right: -6px; /* for positioning - no need to change*/
height: 85%; /* height of parent - height of arrow */
width: 2%; /* no need to change */
bottom: -2px; /* equal to border bottom of parent - no need to change*/
border-right: 2px solid gray;
border-bottom: 2px solid gray;
border-bottom-right-radius: 8px; /* for producing curve on bottom right */
}
/* Just for demo */
body {
background: -webkit-linear-gradient(0deg, crimson, indianred, purple);
background: -moz-linear-gradient(90deg, crimson, indianred, purple);
background: linear-gradient(90deg, crimson, indianred, purple);
}
<div class="shape">
Lorem Ipsum Dolor Sit Amet...
</div>
可以通过更改定位属性 和偏斜方向（从正角到负角）将箭头添加到左侧，如 下面的代码片段所示。
div.shape {
position: relative;
width: 300px;
height: 100px;
padding: 4px;
margin-top: 20px;
margin-left: 20px;
border: 2px solid gray;
border-left: none; /* not required as the shape needs to be transparent */
border-radius: 8px; /* not required as the right border is done through pseudo element */
border-top-left-radius: 0px;
border-bottom-left-radius: 0px;
}
div.shape:before {
position: absolute;
content: '';
top: -2px; /* equal to border top of parent - no need to change*/
left: -6px; /* for positioning - no need to change*/
height: 15%; /* should be changed depending on height of arrow */
width: 10%; /* should be changed depending on width of arrow */
border-top: 2px solid gray;
border-left: 3px solid gray; /* thicker border because skew makes it thin */
/* to achieve the arrow like shape */
-webkit-transform-origin: bottom right;
-webkit-transform: skew(45deg);
-moz-transform: skew(45deg);
transform: skew(45deg);
}
div.shape:after {
position: absolute;
content: '';
left: -6px; /* for positioning - no need to change*/
height: 85%; /* height of parent - height of arrow */
width: 2%; /* no need to change */
bottom: -2px; /* equal to border bottom of parent - no need to change*/
border-left: 2px solid gray;
border-bottom: 2px solid gray;
border-bottom-left-radius: 8px; /* for producing curve on bottom right */
}
/* Just for demo */
body {
background: -webkit-linear-gradient(0deg, crimson, indianred, purple);
background: -moz-linear-gradient(90deg, crimson, indianred, purple);
background: linear-gradient(90deg, crimson, indianred, purple);
}
<div class="shape">
Lorem Ipsum Dolor Sit Amet...
</div>
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