body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
}

header {
  background: #35424a;
  color: #ffffff;
  padding: 10px 0;
  text-align: center;
}

h1 {
  margin: 0;
}

nav {
  margin: 20px 0;
}

nav a {
  color: #ffffff;
  text-decoration: none;
  margin: 0 15px;
}

nav a:hover {
  text-decoration: underline;
}

.container {
  width: 80%;
  margin: auto;
  overflow: hidden;
}

footer {
  background: #35424a;
  color: #ffffff;
  text-align: center;
  padding: 10px 0;
  position: relative;
  bottom: 0;
  width: 100%;
}

.section {
  background: #ffffff;
  padding: 20px;
  margin: 20px 0;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.app-icon {
  border-radius:60px;
  padding : 20px ;
  align-items: center;
  justify-content: center; /* 水平方向の中央揃え */
  align-items: center;
}

.app-icon-container {
  display: grid;
  place-items: center;
  padding-bottom: 20px;
}