Can't make CSS Animations work with #keyframes and position relative/absolute - css-animations

Question

I am trying to practice simple CSS Animations with Keyframes.
I am trying to move the square from left to right, however, this does not seem to be working with position relative/absolute. I works when I do transform: translateX(...) or something similar, but not with the aforementioned method. Any ideas why?
CSS Code:
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
background-color: rgb(70, 70, 162);
}
.box1 {
height: 600px;
width: 80%;
background-color: white;
margin: 50px auto;
border: 5px solid black;
position: relative;
}
.square1 {
height: 100px;
width: 100px;
background-color: red;
position: absolute;
top: 0px;
left: 0px;
animation-name: left-right;
animation-duration: 3s;
animation-timing-function: ease-in-out;
animation-iteration-count: infinite;
animation-direction: alternate;
}
#keyframes left-right {
0% {
top: 0px;
left: 0px;
}
100% {
top: 0px;
right: 0px;
}
}

Answer 1

So, in the Keyframes you had right
100% {
top: 0px;
right: 500px;}
where as it needed to be left
100% {
top: 0px;
left: 500px;}
full code:
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
background-color: rgb(70, 70, 162);
}
.box1 {
height: 600px;
width: 80%;
background-color: white;
margin: 50px auto;
border: 5px solid black;
position: reletive;
}
.square1 {
height: 100px;
width: 100px;
background-color: red;
position: absolute;
top: 0px;
left: 0px;
animation-name: left-right;
animation-duration: 3s;
animation-timing-function: ease-in-out;
animation-iteration-count: infinite;
animation-direction: alternate;
}
#keyframes left-right {
0% {
top: 0px;
left: 0px;
}
100% {
top: 0px;
left: 500px;
/*here*/
}
}