*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
#main-div{
    display: flex;
    flex-direction: column;
    /* border: 1px solid black; */
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100vh;
    
}
span {
    font-size: 5em;
    color: #ff0000;
}
h1 {
    font-size: 2em;
    color: #333;
}
p {
    font-size: 1.2em;
    color: #666;
}