style.css

/* Set font family and size */
body {
    font-family: Arial, sans-serif;
    font-size: 16px;
}

/* Center the counter */
.container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    align-items: center;
    height: 100vh;
}

/* Style the header */
h1 {
    font-size: 7rem;
    font-weight: bold;
    color: #333;
}

/* Style the counter */
#counter {
    font-size: 7rem;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    margin: 20px 0;
}

/* Style the buttons */
.button {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 15px 32px;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
    width: 200px;
}

.button:hover {
    background-color: #3e8e41;
}

.button:active {
    background-color: #3e8e41;
    transform: translateY(4px);
}

#button:focus {
    outline: none;
}

/* media query for mobile */    
@media screen and (max-width: 480px) {
    .counter h1 {
        font-size: 6rem;
    }
}