body {
  margin: 0;
  padding: 0;
  max-width: 100%;
  overflow-x: hidden;
  font-family: Noto Sans JP;
  animation: fadeIn 2.5s cubic-bezier(0.33, 1, 0.68, 1) forwards;
  background-color: #212121;
}

p,
h1,
div {
  color: #FFFFFF;
}

.header-iframe {
  position: fixed;
  width: 100%;
  height: 100px;
  border: none;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
}

main {
  max-width: 100%;
}

.simple_notepad_icon {
  display: block;
  margin: auto;
  margin-top: 100px;
  font-weight: bold;
  border-radius: 10px;
  overflow: hidden;
  max-width: 375px;
  width: 64px;
  height: 64px;
}

.windows {
  text-align: center;
  font-size: 15px;
  color: #0178d4;
  margin: 0;
}

.japanese_title {
  text-align: center;
  font-weight: normal;
  font-size: 30px;
  margin: 0;
}

.catchcopy {
  text-align: center;
  font-size: 15px;
  margin-top: 18px;
}

.download-div {
  text-align: center;
}

.download {
  position: relative;
  display: inline-block;
  padding: 0.25em 0.5em;
  text-decoration: none;
  color: #000000;
  border: solid 1px #000000;
  border-radius: 10px;
  font-size: 20px;
  color: #dcdcdc;
  border: solid 1px #000000;
  margin: 5px;
}

.download:hover {
  background-color: #333333;
  color: #ffffff;
}

.download:active {
  box-shadow: 0 0 2px rgba(0, 0, 0, 0.3);
  background-color: #000000;
}

.explanation {
  display: flex;
  margin: 0 auto;
  margin-top: 50px;
  gap: 20px;
  padding: 0.5em 1em;
  color: #5d627b;
  background: #222222;
  border-top: solid 5px #5d627b;
  box-shadow: 0 3px 5px rgba(0, 0, 0, 0.22);
  width: fit-content;
}

.explanation p {
  font-size: 15px;
  margin: auto;
}

.explanation h2, h3, h4 {
  font-size: 30px;
  margin: auto;
}

.simple_notepad_screenshot {
  max-width: 200px;
}

.link {
  text-decoration: none;
}

.copyright,
.form {
  text-align: center;
  text-decoration: none;
}

table {
  border-collapse: collapse;
  width: 60%;
  text-align: center;      /* 文字の中央揃え */
  margin: 0 auto;          /* テーブル自体を中央寄せ */
  margin-top: 30px;
  border: rgba(255, 255, 255, 0.50) solid 2px; /* テーブルの枠線 */
}

td:first-child {
  width: 30%;
}

td:last-child {
  width: 70%;
}

th {
  background-color: #5d627b;    /* 背景色を青に */
  color: white;
  padding: 8px;
  border: 1px solid #000;
  font-size: 15px;
}

td {
  background-color: #2a2a2a;
  padding: 8px;
  border: rgba(255, 255, 255, 0.15) solid 1px;
  font-size: 15px;
  color: #ffffff;
}

/* thとtdの縦方向中央揃え */
th, td {
  vertical-align: middle;
   /* 枠線の色を青に */
}

.download-p {
  text-align: center;
  font-size: 15px;
  margin-top: 18px;
}

.download2 {
  position: relative;
  display: inline-block;
  padding: 0.25em 0.5em;
  text-decoration: none;
  color: #000000;
  border: solid 1px #000000;
  border-radius: 10px;
  font-size: 20px;
  color: #dcdcdc;
  border: solid 1px #000000;
  margin-bottom: 100px;
}

footer {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  background-color: #171717;
}


@keyframes fadeIn {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}