CSS 半圆效果

Question

我正在尝试仅使用 CSS.

来创建一个独特的形状

但是，半圆底部flat太多了。有没有可能，我可以让曲线正好在中间相交而没有平线？

代码：

button {
  font-size: 1em;
  background: #ffffff;
  border-radius: 10px;
  -moz-border-radius: 10px;
  -webkit-border-radius: 10px;
  border: 1px solid #1588cb;
  color: #1588cb;
  font-weight: 400;
  height: 60px;
  width: 300px;
  position: relative;
  margin: 25px 0 50px 0;
  -webkit-box-sizing: content-box;
  -moz-box-sizing: content-box;
  -o-box-sizing: content-box;
  box-sizing: content-box;
}
.full-circle {
  border: 1px solid #1588cb;
  height: 35px;
  width: 45px;
  -moz-border-radius: 30px;
  -webkit-border-radius: 30px;
  -webkit-box-sizing: content-box;
  -moz-box-sizing: content-box;
  -o-box-sizing: content-box;
  box-sizing: content-box;
  border-radius: 0 0 45px 45px;
  border-top: none;
  height: 15px;
  background: #ffffff;
  position: absolute;
  left: 50%;
  margin-left: -17px;
  bottom: -16px;
  line-height: 0;
}

<button>News
  <span class="full-circle">+</span>
</button>

Answer 1

您的全圆 class 的宽度为 45 像素，而边框半径为 30 像素。如果你希望它是一个半圆，你需要与宽度相同的边框半径。将宽度更改为 30px 似乎可以满足您的要求（试试看）

Answer 2

您可以使用 .full-circle class

的高度和底部 css 属性

button {
    font-size: 1em;
    background: #ffffff;
    border-radius: 10px;
    -moz-border-radius: 10px;
    -webkit-border-radius: 10px;
    border: 1px solid #1588cb;
    color: #1588cb;
    font-weight: 400;
    height: 60px;
    width: 300px;
    position: relative;
    margin: 25px 0 50px 0;
    -webkit-box-sizing: content-box;
    -moz-box-sizing: content-box;
    -o-box-sizing: content-box;
    box-sizing: content-box;
}

.full-circle {
    border: 1px solid #1588cb;
    height: 35px;
    width: 45px;
    -moz-border-radius: 30px;
    -webkit-border-radius: 30px;
    -webkit-box-sizing: content-box;
    -moz-box-sizing: content-box;
    -o-box-sizing: content-box;
    box-sizing: content-box;
    border-radius: 0 0 45px 45px;
    border-top: none;
    height: 19px;
    background: #ffffff;
    position: absolute;
    left: 50%;
    margin-left: -17px;
    bottom: -20px;
    line-height: 0;
}

<button>News<span class="full-circle">+</span></button>

Fiddle

Answer 3

您可以减小宽度以匹配边框半径。

button {
    font-size: 1em;
    background: #ffffff;
    border-radius: 10px;
    -moz-border-radius: 10px;
    -webkit-border-radius: 10px;
    border: 1px solid #1588cb;
    color: #1588cb;
    font-weight: 400;
    height: 60px;
    width: 300px;
    position: relative;
    margin: 25px 0 50px 0;
    -webkit-box-sizing: content-box;
    -moz-box-sizing: content-box;
    -o-box-sizing: content-box;
    box-sizing: content-box;
}

.full-circle {
    border: 1px solid #1588cb;
    height: 15px;
    width: 30px;
    -moz-border-radius: 30px;
    -webkit-border-radius: 30px;
    -webkit-box-sizing: content-box;
    -moz-box-sizing: content-box;
    -o-box-sizing: content-box;
    box-sizing: content-box;
    border-radius: 0 0 45px 45px;
    border-top: none;
    background: #ffffff;
    position: absolute;
    left: 50%;
    margin-left: -17px;
    bottom: -16px;
    line-height: 0;
}

<button>News<span class="full-circle">+</span></button>

Answer 4

你在全圆上有 2 个高度属性 class，在我删除第一个之前有点混乱。

button {
    font-size: 1em;
    background: #fff;
    border-radius: 10px;
    -moz-border-radius: 10px;
    -webkit-border-radius: 10px;
    border: 1px solid #1588cb;
    color: #1588cb;
    font-weight: 400;
    height: 60px;
    width: 300px;
    position: relative;
    margin: 25px 0 50px 0;
    -webkit-box-sizing: content-box;
    -moz-box-sizing: content-box;
    -o-box-sizing: content-box;
    box-sizing: content-box;
}

.full-circle {
    display:block;
    border: 1px solid #1588cb;
    width: 45px;
    -moz-border-radius: 30px;
    -webkit-border-radius: 30px;
    -webkit-box-sizing: content-box;
    -moz-box-sizing: content-box;
    -o-box-sizing: content-box;
    box-sizing: content-box;
    border-radius: 0 0 60px 60px;
    border-top: none;
    height: 25px;
    background: #fff;
    position: absolute;
    left: 50%;
    margin-left: -17px;
    bottom: -26px;
    line-height: 0;
}

https://jsfiddle.net/hj3g3gjL/

更新：

我有点成功了...不管怎样，你欠我一杯啤酒！

.full-circle {
        display:block;
        border-bottom: 1px solid #1588cb;
        width: 45px;
        -moz-border-radius: 45px / 36px;
        -webkit-border-radius: 45px / 36px;
        -webkit-box-sizing: content-box;
        -moz-box-sizing: content-box;
        -o-box-sizing: content-box;
        box-sizing: content-box;
        border-radius: 45px / 36px;
        height: 35px;
        background: #fff;
        position: absolute;
        left: 50%;
        margin-left: -17px;
        bottom: -17px;
        line-height: 40px;
    }

https://jsfiddle.net/awea2s2y/

或者这个稍微好一点？ https://jsfiddle.net/p9hynbrb/

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