I have 2 half-page-sized overlays that translate the opposite ways to give the illusion that the screen is opening up. In addition, I want them to stop at about 8% from the viewport top or bottom and not disappear entirely. It doesn't really work with % because on mobile devices with bars and other UI they are get cut off. I have tried to use vh but it just disappears into the viewport edges.
/*default animations*/
.main-transition-overlay1 {
position: fixed;
background-color: black;
z-index: 10;
height: 50vh;
top: 0;
left: 0;
width: 100%;
animation-name: page-transition-top;
animation-duration: 750ms;
animation-timing-function: ease-in;
animation-fill-mode: forwards;
animation-delay: 2s;
border-bottom: 4px solid #fff;
color: #fff;
box-shadow: 0 0px 1.5px #99ffff, 0 0px 2.5px #99ffff, 0 0px 5.5px #99ffff, 0 0px 10px #0cbfe9, 0 0px 20px #0cbfe9, 0 0px 22px #0cbfe9, 0 0px 25px #0cbfe9, 0 0px 36px #0cbfe9;
}
@keyframes page-transition-top {
from {
transform: translateY(0);
}
to {
transform: translateY(-92vh);
}
}
.main-transition-overlay2 {
position: fixed;
background-color: black;
z-index: 10;
height: 50vh;
top: 50vh;
left: 0;
width: 100%;
animation-name: page-transition-bottom;
animation-duration: 750ms;
animation-timing-function: ease-in;
animation-fill-mode: forwards;
animation-delay: 2s;
border-top: 4px solid #fff;
color: #fff;
box-shadow: 0 0 1.5px #99ffff, 0 0 2.5px #99ffff, 0 0 5.5px #99ffff, 0 0 10px #0cbfe9, 0 0 20px #0cbfe9, 0 0 22px #0cbfe9, 0 0 25px #0cbfe9, 0 0 36px #0cbfe9;
}
@keyframes page-transition-bottom {
from {
transform: translateY(0);
}
to {
transform: translateY(92vh);
}
}
<!--main screen transition overlay-->
<div>
<div ></div>
<div ></div>
</div>
CodePudding user response:
Your transform value for that should be translateY(42vh)
(and -42vh
) instead of /-92vh, that's the amount the elements move up/down:
/*default animations*/
.main-transition-overlay1 {
position: fixed;
background-color: black;
z-index: 10;
height: 50vh;
top: 0;
left: 0;
width: 100%;
animation-name: page-transition-top;
animation-duration: 750ms;
animation-timing-function: ease-in;
animation-fill-mode: forwards;
animation-delay: 2s;
border-bottom: 4px solid #fff;
color: #fff;
box-shadow: 0 0px 1.5px #99ffff, 0 0px 2.5px #99ffff, 0 0px 5.5px #99ffff, 0 0px 10px #0cbfe9, 0 0px 20px #0cbfe9, 0 0px 22px #0cbfe9, 0 0px 25px #0cbfe9, 0 0px 36px #0cbfe9;
}
@keyframes page-transition-top {
from {
transform: translateY(0);
}
to {
transform: translateY(-42vh);
}
}
.main-transition-overlay2 {
position: fixed;
background-color: black;
z-index: 10;
height: 50vh;
top: 50vh;
left: 0;
width: 100%;
animation-name: page-transition-bottom;
animation-duration: 750ms;
animation-timing-function: ease-in;
animation-fill-mode: forwards;
animation-delay: 2s;
border-top: 4px solid #fff;
color: #fff;
box-shadow: 0 0 1.5px #99ffff, 0 0 2.5px #99ffff, 0 0 5.5px #99ffff, 0 0 10px #0cbfe9, 0 0 20px #0cbfe9, 0 0 22px #0cbfe9, 0 0 25px #0cbfe9, 0 0 36px #0cbfe9;
}
@keyframes page-transition-bottom {
from {
transform: translateY(0);
}
to {
transform: translateY(42vh);
}
}
<!--main screen transition overlay-->
<div>
<div ></div>
<div ></div>
</div>