body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: 'Arial', sans-serif;
    line-height: 1.5;
    min-height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
}

.header {
    width: 100%;
    background-color: #1e1e1e;
    padding: 10px;
    display: flex;
    align-items: center;
    color: white;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
}

.logo-container {
    display: flex;
    align-items: center;
    margin-left: 20px;
}

.logo-image {
    width: 50px;
    height: 50px;
    margin-right: 20px;
}

h1 {
    font-size: 24px;
}

.main {
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    padding: 20px;
    margin-top: 100px;
    text-align: center;
    width: 400px;
}

.timer-circle {
    border-radius: 50%;
    width: 200px;
    height: 200px;
    margin: 20px auto;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    color: #e74c3c;
    border: 10px solid #3498db;
    background-color: #f7f7f7;
}

.control-buttons {
    margin-top: 30px;
    display: flex;
    justify-content: space-around;
}

.control-buttons button {
    background-color: #3498db;
    color: #fff;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.control-buttons button:hover {
    background-color: #266094;
}