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

#app {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.checker {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.header {
    display: flex;
    align-items: center;
    height: 20%;
    width: 100%;
    position: relative;
}

.race-time {
    flex: 1;
    text-align: center;
    background-color: #333;
    color: white;
    font-size: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 10%;
}

.stop-button, .undo-button {
    width: 15%;
    font-size: 1rem;
    cursor: pointer;
    background-color: #555;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    height: 100%;
    writing-mode: vertical-rl;
    text-orientation: upright;
}

.stop-button {
    left: 0;
}

.undo-button {
    right: 0;
}

.lap-button {
    flex: 3;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #4CAF50;
    color: white;
    font-size: 3rem;
    margin: 10px 0;
    cursor: pointer;
    text-align: center;
}

.lap-info {
    font-size: 1.5rem;
    margin-top: 10px;
}

.pitstop-button {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f44336;
    color: white;
    font-size: 2rem;
    cursor: pointer;
}

.strikethrough {
    position: relative;
    display: inline-block;
}

.strikethrough::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: red;
    top: 50%;
    left: 0;
    transform: rotate(45deg);
}