As you comment that you use CSS and in doc write:
.scss source files are available if you use Sass as your CSS
precompiler. It’s customizable and modular
Here is alternative with angular and css
Html
<div class="collapse" (click)="ifShow=!ifShow" [ngClass]="{'hide':!ifShow}">
<span></span>
<span></span>
<span></span>
</div>
CSS:
.collapse{
position: relative;
cursor: pointer;
}
.collapse span{
position: absolute;
width: 40px;
height: 4px;
border-radius: 4px;
background-color: black;
}
.collapse span:nth-child(2) {
top: 10px;
}
.collapse span:nth-child(3){
top: -10px;
}
.hide span:nth-child(2) {
transform:rotate(45deg);
top:0;
}
.hide span:nth-child(3){
transform:rotate(-45deg);
top: 0;
}
.hide span:nth-child(1){
animation:hideMain 1.5s;
opacity: 0;
}
.hide span:nth-child(2),.hide span:nth-child(3) {
animation:hide 1.5s;
}
@keyframes hide{
0%{
transform:rotate(0);
}
50%{
top:0;
transform:rotate(0);
}
}
@keyframes hideMain{
49%{
opacity: 1;
}
50%{
opacity: 0;
}
}
TS:
ifShow : boolean = true;