Javascript 如何将下拉菜单与按钮对齐

function myFunction() {
  var x = document.getElementById("Demo");
  if (x.className.indexOf("w3-show") == -1) {
    x.className += " w3-show";
  } else {
    x.className += " w3-hide";
    setTimeout(function() {
      x.className = x.className.replace(" w3-show", "");
      x.className = x.className.replace(" w3-hide", "");

    }, 500)
  }
}

.container {
  display: block;
  margin: 0 0;
  position: absolute;
  top: 10px;
  right: 0px;
}

/*Items menu*/
.user_menu_item {
  display: flex;
  align-items: center;
}

.user_menu_item:hover {
  background: whitesmoke;
  border-left: 4px solid blue;
  transition: 0.3s;
}

.user_menu_item:not(:hover) {
  transition: 0.3s;
}

.user_menu_item>a {
  display: flex;
  align-items: center;
  padding: 12px 10px 12px 10px;
  width: 100%;
  font-size: 14px;
  color: #75777D;
}

.w3-container {
  position: absolute;
  top: 25px;
  right: 0px;
}

.w3-dropdown-click {
  display: flex;
  position: relative;
}

.w3-dropdown-content {
  display: none;
  background-color: whitesmoke;
  min-width: 160px;
  overflow: hidden;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  z-index: 1;
  position: relative;

  animation: animateFromBottom 0.6s
}

@keyframes animateFromBottom {
  from {
    bottom: -50px;
    opacity: 0
  }

  to {
    bottom: 0;
    opacity: 1
  }
}

@keyframes animateToBottom {
  from {
    bottom: 0;
    opacity: 1
  }

  to {
    bottom: -50px;
    opacity: 0
  }
}

.w3-bar-block .w3-bar-item {
  width: 100%;
  display: block;
  padding: 8px 16px;
  text-align: left;
  border: none;
  white-space: normal;
  float: none;
  outline: 0;
}

.w3-show-block,
.w3-show {
  display: block !important
}

.w3-dropdown-content.w3-hide {
  animation: animateToBottom 0.6s
}

.w3-button {
  display: block;
}

<div class="container">
  <button onclick="myFunction()" class="w3-button">Click Me!</button>

  <div class="w3-container">
    <div class="w3-dropdown-click">


      <div id="Demo" class="w3-dropdown-content w3-bar-block w3-border">
        <div class="user_menu_item">
          <a href="/account">
            <span class="link_text">Dashboard</span>
          </a>
        </div>

        <div class="user_menu_item">
          <a href="ordini">
            <span class="link_text">I miei ordini</span>
          </a>
        </div>

        <div class="user_menu_item">
          <a href="libreria">
            <span class="link_text">Downloads</span>
          </a>
        </div>

        <div class="user_menu_item">
          <a href="impostazioni">
            <span class="link_text">Impostazioni</span>
          </a>
        </div>

        <div class="user_menu_item">
          <a href="wp-login.php?action=logout">
            <span class="link_text">Logout</span>
          </a>
        </div>
      </div>

    </div>
  </div>
</div>