body {
    text-align: center;
    justify-content: center;
    font-family: Arial, Helvetica, sans-serif;
    background-color: aquamarine;
    display: flex;
    height: 100vh;
    
}
.counter{
    justify-content: center;
    text-align: center;
    display: flex;
}
.btn{
    background-color: azure;
    height: 40px;
    font-size: 25px;
    padding: 10px 15px;
}

.btn:hover{
    background-color: aqua;
}