'CSS Grid - Children do not center and ul does not extend full-width on transform: rotate?

I am starting with CSS and I have a doubt, I do not understand why the section . aside2, takes the width based on the text that puts it inside and not the one specified in the grid of the body, what I want to do is to have the links of. aside2 rotated but with the width assigned in the grid-template-columns and not that I take it depending on whether I add more text or not, and understand why I will not, to see if someone can help me

*fill text because it says my post is mostly code, fill text because it says my post is mostly code

*{
    margin: 0;
    padding: 0;
    list-style: none;
    text-decoration: none;
    color: white;
}
body{
    background-color: rgb(17, 17, 17);
    display: grid;
    grid-template-columns: 140px 1fr;
    grid-template-rows: 80px 1fr;
    height: 100vh;
}
aside{
    grid-column: 1/2;
    grid-row: 1/3;
    width: 100%;
    display: grid;
}
.aside1{
    background: rgb(116,191,244);
    background: linear-gradient(0deg, rgba(116,191,244,1) 0%, rgba(255,162,222,1) 100%);
    box-shadow: 30px 0px 192px 100px rgba(0,43,255,0.15);
}
.aside2{
    box-sizing: border-box;
    display:flex;
    justify-content: center;
    align-items: center;
}
.aside2 ul{
    display: flex;
    transform: rotate(-90deg);
}
.aside2 ul li{
}
.aside2 ul li a{
    color: white;
}
header{
    grid-column: 2/3;
    grid-row: 1/2;
}
main{
    grid-column: 2/3;
    grid-row: 2/3;
}
h1{
    font-size: 50px;
}
<!DOCTYPE html>
<html lang="es">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="assets/css/style.css">
</head>
<body>
    <aside>
        <section class="aside1">
            <span>Hola</span>
        </section>
        <section class="aside2">
            <ul>
                <li><a href="">Instagram</a></li>
                <li><a href="">Twitter</a></li>
                <li><a href="">Facebook</a></li>
            </ul>
        </section>
    </aside>
    <header>
        <nav>
            <a href="">G6</a>
            <ul>
                <li><a href="">Buy NFT</a></li>
                <li><a href="">Whitepaper</a></li>
                <li><a href="">Feeding</a></li>
                <li><a href="">FAQ</a></li>
                <li><a href="">Connect Wallet</a></li>
            </ul>
        </nav>
    </header>
    <main>
        <section>
            <h1>Discover rare digital art and collect NFTs</h1>
            <div>
                <img src="" alt="a">
                <img src="" alt="b">
                <img src="" alt="c">
            </div>
            <img src="" alt="FOTO NFT">
        </section>
        <div>
            <img src="" alt="Una">
            <img src="" alt="Dos">
        </div>
    </main>
</body>
</html>
htmlcssflexboxcss-grid


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