강의 출처 : Udemy 50 mini projects - Brad Traversy
.panel:nth-of-type(4)
{display : none;};
<button disabled></button>
button:disabled{
cursor : not-allowed};
button.disabled =true;
.progress-container::before{
content="";
background-color:#fff;
height : 3px;
width :100%;}
nav{
transform:rotate(30deg);
transform-origin : top left;}
.nav2{
transform:rotate(30deg);
transform-origin : 40px 40px;}
nav ul li + li{
margin-left:15px;}
nav ul li + li + li{
margin-left:30px;}
.container.show-nav + nav li{
transform : translateX(0);
transition-delay : 0.3s;}
background-image : linear-gradient(90deg, #7d5fff, #7158e2);