*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    font-family: Arial, Helvetica, sans-serif;
    background-color: aqua;
    color: white;
    font-size: 1,5rem;
    display: flex;
    justify-content: center;
    height: 100vh;
    align-items: center;
    user-select: none;
}
#demo{
    display: flex;
    justify-content: center;
    align-items: center;
    
    width: 50%;
    height: 50%;
    padding: 1rem;
    background-color: #57c5d6;
    overflow: hidden;
}
img{
    max-width: 100%;
    max-height: 100%;
    border-radius: 0,75rem ;
    border: 1px solid black;
    object-fit: contain;
}