/* ===== メイン ===== */
header h1,
h1 {
    margin: 0;
    /* 見出しの余白をゼロに */
    padding: 0;
}

.main-content {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    background: #f7fcfe;
    padding: 40px;
    padding-top: 20px !important;
    flex: 1;
}

.main-content h1 {
    font-weight: 700;
    /* 太字 */
    position: relative;
    padding-bottom: 0.2em;
    /* 線との距離 */
    margin-top: 1em;
}

.main-content h1::after {
    content: "";
    position: absolute;
    left: -0.2em;
    bottom: 0;
    width: 100%;
    height: 3px;
    background-color: #59b9c6;
    /* 仮の色 */
}

h2 {
    margin-top: 2em;
    margin-bottom: -0.5em;
}

h3 {
    margin-bottom: -0.8em;
}