body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    background: linear-gradient(rgba(0,0,0,0.3), rgba(0,0,0,0.3)), url('フキハラ背景.png')
}

header {
    text-align: center;
    margin-bottom: 3rem;
}
history-box {
    background-color: blue;
    border: 2px solid #00ffff;
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

h1 { color: #38bdf8; }

.card {
    background-color: forestgreen;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    border-left: 5px solid #38bdf8;
}