```css
.about-page {
  padding-top: 30px;
  padding-bottom: 40px;
}

.about-ad {
  width: 100%;
  margin: 0 auto 30px;
  text-align: center;
}

.about-ad-bottom {
  margin-top: 30px;
  margin-bottom: 0;
}

.about-card {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 45px 35px;
  text-align: center;
  background: #fff;
  border: 1px solid rgba(0, 0, 0, .08);
  border-radius: 6px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, .08);
}

.about-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: #007bff;
  color: #fff;
  font-size: 30px;
}

.about-card h1 {
  margin: 0 0 20px;
  font-size: 30px;
  font-weight: 600;
  color: #333;
}

.about-card p {
  max-width: 760px;
  margin: 0 auto;
  color: #666;
  font-size: 17px;
  line-height: 1.8;
}

@media (max-width: 767.98px) {
  .about-page {
    padding-top: 20px;
    padding-bottom: 30px;
  }

  .about-card {
    padding: 35px 20px;
  }

  .about-card h1 {
    font-size: 25px;
  }

  .about-card p {
    font-size: 15px;
    line-height: 1.7;
  }

  .about-icon {
    width: 60px;
    height: 60px;
    font-size: 25px;
  }
}
```