css - CSS - 固定按钮展开

我更新了这个 CSS 代码。我曾经position: absolute;将按钮放在栏的右侧。因此，即使在输入打开后，按钮也会保持在右侧而不移动。

@media (max-width: 768px) {
  .header-search {
    margin-left: 1em;
    position: relative;
    .search-bar__input {
      margin-left: 10px;
      background: transparent;
      overflow: hidden;
    }

    .search-bar__btn {
      width: 40px;
      position: absolute;
      right: 1px;
      height: 29px;
    }

body {
  display: flex;
  flex-direction: column;
  margin: 0;
  min-height: 100vh;
  font-size: 14px;
}

ol,
ul {
  padding: 0;
  margin: 0;
  list-style: none;
}

main {
  flex: 1;
}

.material-icons {
  font-size: 24px;
  vertical-align: middle;
}

.material-icons::before {
  content: attr(icon);
}

.site-header {
  position: sticky;
  top: -40px;
  width: 100%;
  z-index: 99;
  background: #fff;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.top-nav {
  background: rgba(0, 0, 0, 0.03);
}

.top-nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 40px;
}

.top-nav ul {
  display: flex;
  font-size: 12px;
  list-style: none;
}

.top-nav ul>li+li {
  margin-left: 1.5em;
}

.top-nav ul a {
  color: currentColor;
}

.main-nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 5em;
}

.header-brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-brand .logo {
  text-decoration: none;
  color: currentColor;
}

.header-brand .menu-toggle {
  display: none;
  border: 0;
  outline: 0;
  background: transparent;
  margin-left: 1em;
  padding: 6px;
}


/* BEGIN SEARCH BAR */

.header-search {
  flex: auto;
  margin-left: 4em;
}

.header-search .search-bar {
  display: flex;
  align-items: center;
  border: 1px solid rgba(0, 0, 0, 0.1);
  max-width: 25em;
  height: 2.5em;
  transition: all 3s;
}

.header-search .search-bar__input {
  flex: auto;
  height: 100%;
  border: 0;
  padding: 0 1em;
  outline: 0;
}

.header-search .search-bar__btn {
  width: 3em;
  height: 100%;
  border: 0;
  outline: 0;
  text-align: center;
}

@media (max-width: 768px) {
  .header-search {
    margin-left: 1em;
    position: relative;
  }
  .header-search .search-bar__input {
    margin-left: 10px;
    background: transparent;
    overflow: hidden;
  }
  .header-search .search-bar__btn {
    width: 40px;
    position: absolute;
    right: 1px;
    height: 29px;
  }
  .header-search .search-bar {
    max-width: 3em;
    margin-left: auto;
  }
  .header-search .search-bar:focus-within {
    max-width: 100%;
  }
  .header-search .search-bar:focus-within .search-bar__input {
    width: auto;
  }
  .header-search .search-bar__input {
    width: 0;
    padding: 0;
  }
}


/* END SEARCH BAR */

.header-user {
  display: flex;
  align-items: center;
}

.header-user .item {
  position: relative;
  flex-shrink: 0;
  display: inline-flex;
}

.header-user .item .user-link {
  font-weight: 500;
  color: currentColor;
  padding: 6px;
  border-radius: 4px;
  margin-left: 8px;
}

.header-user .item .user-link:hover {
  text-decoration: none;
  background-color: rgba(0, 0, 0, 0.03);
}

@media (max-width: 768px) {
  .s-header {
    top: 0;
  }
  .top-nav {
    display: none;
  }
  .main-nav .container {
    height: 4em;
  }
  .header-brand .menu-toggle {
    display: inline-block;
    margin-left: 0;
  }
}

<link href="https://cdnjs.cloudflare.com/ajax/libs/material-design-icons/3.0.1/iconfont/material-icons.min.css" rel="stylesheet" />
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet" />

<body>
  <header class="site-header">
    <div class="top-nav">
      <div class="container">
        <ul>
          <li><a href="#">Top menu item</a></li>
          <li><a href="#">Top menu item</a></li>
          <li><a href="#">Top menu item</a></li>
          <li><a href="#">Top menu item</a></li>
          <li><a href="#">Top menu item</a></li>
        </ul>
      </div>
    </div>
    <nav class="main-nav">
      <div class="container">
        <div class="header-brand">
          <a class="logo d-none d-md-inline-block" href="#">LOGO HERE</a>
          <button class="menu-toggle">
                        <i class="material-icons" icon="menu"></i>
                    </button>
        </div>
        <div class="header-search">
          <form action="#" class="search-bar">
            <input class="search-bar__input" type="search" placeholder="Search..." />
            <button class="search-bar__btn" type="button">
                            <i class="material-icons" icon="search"></i>
                        </button>
          </form>
        </div>
        <ul class="header-user">
          <li class="item">
            <a class="user-link" href="#">
              <i class="material-icons" icon="person_add"></i>
              <span class="d-none d-md-inline">Login / Register</span>
            </a>
          </li>
        </ul>
      </div>
    </nav>
  </header>
  <main>
    <div class="container" style="height: 1000px">
      <p class="mt-4">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
        dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    </div>
  </main>
  <footer>
    <div class="container">
      <p>Footer content</p>
    </div>
  </footer>
</body>

css - CSS - 固定按钮展开

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