如何在导航栏上垂直对齐图标？

我试图垂直对齐导航栏上的图标，然后尝试使用这种方法：

.element {
 position: relative;
 top: 50%;
 transform: translateY(-50%);
}

这是我的代码：

的HTML

的CSS

/*--------------------------------HEADER--------------------------------------*/

ul {
  list-style-type: none; /* Removes the bullets. A navigation bar does not need list markers */
  margin: 0; /* to remove browser default settings */
  padding: 0; /* to remove browser default settings */
  text-align: left; /* solves the behavior of center because of body tag text-align center */
}


li {
  display: inline; /* By default, 
 elements are block elements. Here, we remove the line breaks before and after each list item, to display them on one line */
}

a:link {
  text-decoration: none; /* unvisited link remove default undline */
}

a:active {
  color: black;  /* selected link remove default red color */
}

.icon {
  float: right; /* use float to get block elements to slide next to each other */
}

#ioaka_icon1 {
  height: 50px;
}

#signup_icon {
  height: 44px;
}

#login_icon {
  height: 50px;
}

.navbar {
  max-width: 100%;
  height: 65px;
  line-height: 65px; /* Aligns text vertically to the div the value has to be the same as the div! */
  background-color: white;
  border-bottom: #cfcfcf 3px solid;
}

如果在这种情况下使用：

.nav ul {
  position: relative;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}

看来元素只会到达50%顶部（transform: translateY(-50%);）和top: 50%; 没有做任何改变？

问题：我缺少什么，为什么它不起作用？提前致谢！