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Уголки у блока со скруглениями

by Ankhena

HTML

<div class="block block-1"></div>
<div class="block block-2"></div>
<p>Прозрачность у основного блока, чтобы было понятно</p>

CSS

@import url('https://fonts.googleapis.com/css2?family=Neucha&display=swap');


* {
  box-sizing: inherit;
}

html {
  box-sizing: border-box;
}

body {
  padding: 50px;
  margin: 0;
  font-family: 'Neucha', cursive;
}

.block {
  position: relative;
  width: 200px;
  height: 200px;
  margin-bottom: 40px;
  border-radius: 4px;
  //background: #fff;
  background: #fffe;
}

.block::before {
  content: "";
  position: absolute;
  top: -2px;
  bottom: -2px;
  right: -2px;
  left: -2px;
  border-radius: 5px;
  z-index: -1;

}

.block-1::before {
  background: linear-gradient(to top left, deeppink 30px, transparent 31px, transparent calc(100% - 31px), deeppink calc(100% - 30px)), linear-gradient(to top right, deeppink 30px, transparent 31px, transparent calc(100% - 31px), deeppink calc(100% - 30px));
}

.block-2::before {
  background: linear-gradient(to top left, transparent calc(50% - 30px), deeppink calc(50% - 30px), deeppink calc(50% + 30px), transparent calc(50% + 30px)), linear-gradient(to top right, transparent calc(50% - 30px), deeppink calc(50% - 30px), deeppink calc(50% + 30px), transparent calc(50% + 30px));
}