style.css

*{
    padding:0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
body{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
button{
    padding:1rem;
    font-size: 1rem;
    border-radius: 5px;
    border:1px solid #999;
    box-sizing: border-box;
    background-color: #eee;
}
button:active{
    background-color: #d0d0d0;
}
main{
    padding:5rem;
    display: flex;
    flex-wrap: wrap;
    gap:1rem;
    align-items: center;
    justify-content: center;
}
.student-data{
    border:1px solid #d0d0d0;
    padding:1rem;
    border-collapse: collapse;
}
.student-data *{
    padding:1rem;
    border:1px solid #d0d0d0;
    border-collapse: collapse;
}
.student-data tr:nth-child(2n-1){
    background-color: #dfdfdf;
}
.student-data tr:nth-child(2n){
    background-color: #eee;
}