.fullwidth-balloon {
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  background: #274a78;           /* 帯の色（ネイビー） */
  padding: 64px 16px 72px;      /* 上 左右 下（三角分を考慮） */
  display: flex;
  align-items: center;           /* 縦中央 */
  justify-content: center;       /* 横中央 */
  text-align: center;
}

.fullwidth-balloon p {
  margin: 0;
  font-size: 50px;
  line-height: 1.35;
  font-weight: bold;
  color: #FFFFFF;
  font-weight: bold;
}

@media screen and (max-width: 1024px) {
  .fullwidth-balloon p {
    font-size: 36px;
  }
}

@media screen and (max-width: 768px) {
  .fullwidth-balloon {
    padding: 20px 12px 28px;
  }

  .fullwidth-balloon p {
    font-size: 24px;
    line-height: 1.4;
  }
}

@media screen and (max-width: 375px) {
  .fullwidth-balloon p {
    font-size: 20px;
  }
}

/* ▼ 三角部分 */
.fullwidth-balloon::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -30px;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
  border-top: 30px solid #274a78;
}