함수 calc()

    
      <div>
        Lorem ipsum odor amet, consectetuer adipiscing elit. Montes malesuada pharetra mi suscipit suspendisse ornare.
        Fringilla feugiat cursus finibus commodo, faucibus himenaeos.
      </div>
    
  

    
      div {
        width: calc(100% - 50px);
        margin: calc(1em + 10px);
        background: lightblue;
      }
    
  

    
      <div class="container">
        Lorem ipsum odor amet, consectetuer adipiscing elit. Montes malesuada pharetra mi suscipit suspendisse ornare.
        Fringilla feugiat cursus finibus commodo, faucibus himenaeos.
      </div>
    
  

    
      .container {
        width: calc(100% - 40px);
        margin: 20px;
        background: lightgreen;
      }
    
  

    
      <div class="sidebar">
        <ul>
          <li><a href="#"></a>Article 1</li>
          <li><a href="#"></a>Article 2</li>
          <li><a href="#"></a>Article 3</li>
        </ul>
      </div>
    
  

    
      .sidebar {
        width: calc(100% - 250px);
        background: tomato;
      }
    
  

    
      <div class="element">Element</div>
    
  

    
      .element {
        height: calc(20px * 3);
        background: lightpink;
      }
    
  

    
      <div class="box">
        Box
      </div>
    
  

    
      .box {
        width: calc(100% / 3);
        background: yellow;
      }
    
  

    
      <header class="header">
        <nav>
          <ul>
            <li>메인</li>
            <li>소개</li>
            <li>연락처</li>
          </ul>
        </nav>
      </header>
    
  

    
      .header {
        height: calc(100vh - 100px);

        background: lightgreen;
      }

      nav ul {
        list-style: none;
        display: flex;
        justify-content: space-around;
        padding: 10px;
      }
    
  

    
      <div class="content">
        Lorem ipsum odor amet, consectetuer adipiscing elit. Montes malesuada pharetra mi suscipit suspendisse ornare.
        Fringilla feugiat cursus finibus commodo, faucibus himenaeos.
      </div>
    
  

    
      .content {
        width: calc(100% - 2 * 20px);
        background: lightgreen;
      }
    
  

    
      <div class="container">
        Lorem ipsum odor amet, consectetuer adipiscing elit. Montes malesuada pharetra mi suscipit suspendisse ornare.
        Fringilla feugiat cursus finibus commodo, faucibus himenaeos.
      </div>
    
  

    
      .container {
        padding: 10px;
        background: tomato;
      }

      @media (min-width: 600px) {
        .container {
          padding: calc(10px + 2vw);
        }
      }
    
  

    
      <div class="container">
        Lorem ipsum odor amet, consectetuer adipiscing elit. Montes malesuada pharetra mi suscipit suspendisse ornare.
        Fringilla feugiat cursus finibus commodo, faucibus himenaeos.
      </div>
    
  

    
      :root {
        --main-padding: 20px;
      }

      .container {
        padding: var(--main-padding);
        background: yellow;
      }

      @media (max-width: 600px) {
        .container {
          padding: calc(var(--main-padding) / 2);
        }
      }