hello
why when i use justify-self the item disappear?
<head>
<style>
.container-main{
width: 100%;
height: 25vh;
display: grid;
grid-template-columns: 1fr 1fr;
grid-template-rows: 1fr 1fr;
grid-gap: 2vw;
}
.box1-main{
background-color: red;
align-self: center;
}
.box2-main{
background-color: blue;
}
.box3-main{
background-color: green;
}
</style>
</head>
<body>
<div class="container-main">
<div class="box1-main"></div>
<div class="box2-main"></div>
<div class="box3-main"></div>
</div>
</body>