th {
  position: sticky;
  top: 0;
  background-color: #fff; /* Чтобы не просвечивало содержимое */
}

<img class="lazy-avatar" src="image.jpg" alt="Аватар">

.lazy-avatar {
  width: 300px;
  height: 300px;
  border-radius: 50%;
}

<div class="avatar">
  <img src="image.jpg" alt="Аватар">
</div>

.avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  overflow: hidden;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

tr:nth-child(even) {
  background-color: #e0e0e0;
}

tr:hover {
  background-color: #f1f9ff;
}

.shape {
  float: left;
  shape-outside: circle(50%);
  width: 200px;
  height: 200px;
  background: #3498db;
  border-radius: 50%;
}

.circle {
  clip-path: circle(50% at center);
}

.ellipse {
  clip-path: ellipse(25% 40% at 50% 50%);
}

.rhombus {
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}

.hero {
  min-height: 50vh;
  background: #4a6bff;
  color: white;
  display: flex;
  flex-direction: column;
  justify-content: center;
  clip-path: polygon(0 0, 100% 0, 100% 80%, 0 100%);
}

.container {
  columns: auto 20rem;
}

<div class="card">
  <h2 class="title">Карточка</h2>
  <button class="button">Кнопка</button>
</div>

.card {
  background: #f5f5f5;
  padding: 16px;
  
  .title { 
    font-size: 20px; 
  }
  
  .button {
    background: #007bff;
    color: #fff;
    padding: 8px;
    
    &:hover { 
      background: #0056b3; 
    }
  }
}

.card { 
  background: #f5f5f5; 
  padding: 16px; 
}

.card .title { 
  font-size: 20px; 
}

.card .button { 
  background: #007bff; 
  color: #fff; 
  padding: 8px; 
}
.card .button:hover { 
  background: #0056b3; 
}

<a href="#:~:text=фрагмент">ссылка на фрагмент</a>

::target-text {
  background: black;
  color: white;
}

html {
  scroll-padding-top: 80px; /* Высота хедера */
}