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Dream
Asked:2025-02-14 22:40:00 +0000 UTC2025-02-14 22:40:00 +0000 UTC

如何在 css 中制作一个带有尾巴的矩形？

  • 772

请告诉我如何制作一个左上角带有箭头的矩形？我尝试::before用半圆形，但无法实现这种形状。

.BigField {
  position: relative;
  left: 0;
  top: 74px;
  height: 50px;
  width: 624px;
  box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1);
  background-color: white;
}

.SmallField {
  position: relative;
}

.SmallField form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.textarea-wrapper {
  position: relative;
}


.textarea-wrapper::before {
  content: "";
  position: absolute;
  width: 10px;
  height: 10px;
  border: 10px solid transparent;
  border-right-color: rgb(255, 0, 0);
  border-radius: 50%;
  left: 20px;
  top: 3px;
}


.SmallField textarea {
  position: absolute;
  height: 28px;
  width: 572px;
  top: 8px;
  right: 8px;
  resize: none;
  border-radius: 14px;
  outline: none;
  border: none;
  color: white;
  background-color: rgba(0, 0, 0);
  padding: 0 11px;
  line-height: 28px;
  cursor: text;
  caret-color: white;
  box-sizing: border-box;
}

.SmallField textarea::placeholder {
  color: white;
}
<div class="BigField">
  <div class="SmallField">
    <form>
      <div class="textarea-wrapper">
        <textarea placeholder="Текст"></textarea>
      </div>
    </form>
  </div>
</div>

在此处输入图片描述

css

1 个回答

  1. Best Answer

    对于支持轮廓圆角的浏览器：

    body {
  background: repeating-linear-gradient(to right, white, antiquewhite, white 2em);
}

div {
  --r: 1.5em;

  background: silver;
  width: fit-content;
  padding: 1em 2em;
  border-radius: var(--r);
  border-top-left-radius: 0;
  margin-left: var(--r);
  position: relative;
}

div::before {
  content: "";
  position: absolute;
  inset: 0 100% auto auto;
  box-sizing: content-box;
  height: var(--r);
  aspect-ratio: 1;
  border-top-right-radius: 100%;
  outline: var(--r) solid silver;
  clip-path: inset(0 0 0 1px); /* 1px от полоски-артефакта слева */
  
  animation: tail 1s linear alternate infinite;
}

@keyframes tail {
  from { aspect-ratio: 1 / 2; }
  to { aspect-ratio: 1; }
}
    <div>Привет</div>
<br>
<div>Привет<br>от высокого<br>блока</div>

    • 5

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