<p class="max-tree-lines">Lorem ipsum dolor sit amet consectetur adipisicing elit. Eaque nisi harum possimus repellat deserunt officia aspernatur quae! Unde voluptates quidem quae, nostrum, voluptate eligendi perspiciatis quod dolorum qui esse eaque!</p>

body {
  display: grid;
  place-content: center;
  margin: 0;
  min-height: 100vh;
  background-color: hsl(222,50%,60%);
  font-family: sans-serif;
}

p {
  max-width: 40ch;
}

p.max-tree-lines {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;  
  overflow: hidden;
}