html - 独特按钮形状的边框样式

Question

我正在尝试对齐伪元素的边框以均匀匹配按钮的边框。我正在使用 ::before 和 ::after 伪元素叠加来获得这种效果，但它们与边界的其余部分不匹配。

我弄乱了左右定位以及每个元素的边框宽度，但似乎无法让它们完美对齐

* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

.btn-txt{
  color: black;
}

button {
  border: none;
  outline: none;
  padding: 0;
  border-width: 0;
  left: 40%;
}

button:hover {
  cursor: pointer;
}

.signpost { /* our rectangle */
  width:250px;
  height:50px;
  background-color: yellow;
  margin:0px auto;
  position: relative;
  border-top: 2px solid red;
  border-bottom: 2px solid red;
  border-left: 2px solid red;
}

.signpost:after { /*  our pseudo-element */
  content:"";/* required */
  position: absolute; /* takes the 'cap' out off flow */
  top:0%; /* stick it to top edge of the sign */
  left:81%; /* push it way overto the right*/
  height:0; /* we're doing this with borders remember */
  width:0; 
  border-width: 25px;
  border-style:solid;
  border-color: #fff; /* same as bg of our rectangle */
  /* now we make some of theborders disappear*/
  border-top-color:transparent;
  border-bottom-color:transparent;
  border-left-color:transparent;
}

.signpost:before { /*  our pseudo-element */
  content:"";/* required */
  position: absolute; /* takes the 'cap' out off flow */
  top:0%; /* stick it to top edge of the sign */
  left:80%; /* push it way overto the right*/
  height:0; /* we're doing this with borders remember */
  width:0; 
  border-width: 25px;
  border-style:solid;
  border-color: red; /* same as bg of our rectangle */
  /* now we make some of theborders disappear*/
  border-top-color:transparent;
  border-bottom-color:transparent;
  border-left-color:transparent;
}

<button class="signpost">
  <p class="btn-txt">HELLO</p>
</button>

当前问题示例：https ://codepen.io/codingforthefuture/pen/YzKeeVJ

标签： htmlcssbutton

Answer 1

这是一个不同的想法，代码更少，对齐很容易处理：

.box {
  display:inline-block;
  position:relative;
  margin:10px;
  padding:10px 50px 10px 10px;
  border:2px solid red;
  border-right:0;
  z-index:0;
  background:linear-gradient(yellow,yellow) left/calc(100% - 40px) 100% no-repeat;
}
.box:before,
.box:after{
  content:"";
  position:absolute;
  z-index:-1;
  right:0;
  width:40px;
  top:0;
  bottom:50%;
  border-right:2px solid red;
  background:yellow;
  transform:skewX(-45deg);
  transform-origin:top;
}
.box:after {
  transform:skewX(45deg);
  transform-origin:bottom;
  top:50%;
  bottom:0;
}

<div class="box"> some text </div>
<div class="box"> some long long text </div>
<div class="box"> some long <br> long text </div>