body{
    background-color: rgb(2, 17, 51);
    font-family: Tahoma;
    color: aliceblue;
    text-align: center;
    margin: auto;
}


.header{
    text-align: center;
    margin-bottom: 20px;
    padding: 15px;
    font-style: oblique;
    font-size: 20px;
    transition-duration: 0.3s;
}

.header:hover{
    letter-spacing: 3px;
    transition: 0.3s;
}


button{
    padding: 8px;
    margin: 5px;
    border-radius: 10px;
    box-shadow: 0px 0px 10px palevioletred;
    background-color: purple;
    color:bisque;
    font-size: 18px;
    cursor:pointer
}

#counter{
    font-size: xxx-large;
}