.container {
    margin: 0 auto;
    max-width: 400px;
    text-align: center;
    padding: 20px;
}

.title {
    font-size: 36px;
    margin-bottom: 10px;
    color: #2c3e50;
}

.timer {
    font-size: 72px;
    color: #2c3e50;
}

button {
    font-size: 38px;
    padding: 10px 5px 10px 5px;
    margin: 1px;
    color: black;

    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-transform: uppercase;
    transition: opacity 0.3s ease -in -out;
}

button:hover {
    opacity: 0.7;
}

#start {
    background-color: #27ae60;
}

#stop {
    background-color: #c0392b;
}

#reset {
    background-color: #7f8c8d;
}