body {
  margin: 0;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  line-height: 1.5;
}

img {
  width: 100%;
  height: auto;
}

.container {
  width: 90%;
  max-width: 980px;
  margin: auto;
}

.clear::after {
  content: "";
  clear: both;
  display: block;
}

ul {
  list-style: none;
  list-style-type: none;
}

a {
  text-decoration: none;
  color: black;
}

a:hover {
  opacity: .7;
}

/* header */

header {
  padding: 20px 0;
  background-color: #E3E3E3;
}

.header-title {
  font-size: 24px;
  font-weight: bold;
}

.header-left {
  float: left;
}

.header-right {
  float: right;
}

.header-nav-item {
  float: left;
  margin-left: 50px;
}

.header-nav-item a {
  font-size: 15px;
  font-weight: 600;
  line-height: 40px;
}

/* top */



/* section about */

.section-title {
  text-align: center;
}

.about-1 {
  background-color: #E3E3E3;
  padding: 20px 0;
}

.about-box {
  border: 2px solid #707070;
  display: flex;
  margin-bottom: 20px;
}

.about-box img {
  width: 30%;
  padding: 45px 40px;
}

.about-text {
  text-align: center;
}

.about-text p {
  font-size: 15px;
  letter-spacing: 2px;
  padding-right: 40px;
}

.about-1-box {
  display: flex;
  justify-content: space-between;
  text-align: center;
}

.about-1-item {
  border: 2px solid #707070;
  width: 30%;
}

.about-1-box img {
  width: 90%;
  margin-top: 10px;
}

.contact {
  background-color: #E3E3E3;
  margin-top: 20px;
  padding: 20px 0;
}

.contact-text {
  text-align: center;
  font-size: 32px;
  font-weight: bold;
  margin-bottom: 30px;
}

input[type="email"], input[type="text"] {
  width: 600px;
  border: 3px solid #707070;
  font-size: 18px;
  display: block;
  margin: auto;
  padding: 15px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.btn-register {
  background-color: #707070;
  display: block;
  margin: auto;
}

.btn {
  padding: 20px 60px;
  color: white;
  font-size: 24px;
  font-weight: bold;
  border-radius: 4px;
  border: none;
}

.btn:hover {
  opacity: .7;
  cursor: pointer;
}

/* スマホ用css */
@media only screen and (max-width: 767px) {
  
  .clear::after {
    content: none;
  }

  .section {
    padding: 80px 0;
  }
  
  .header-left {
    float: none;
  }

  .header-title {
    text-align: center;
  }

  .header-right {
    float: none;
  }

  .header-nav {
    display: flex;
    justify-content: space-between;
    padding: 0;
  }

  .header-nav-item {
    float: none;
    margin: 0;
  }

  .container {
    display: block;
  }

  .about-box {
    border: none;
    display: block;
  }

  .about-box img {
    width: 100%;
    padding: 0;
  }

  .about-text p {
    padding: 0;
  }

  .about-1-box {
    display: block;
  }

  .about-1-item {
    width: 100%;
    margin-top: 20px;
  }

  .about-1-box img {
    width: 50%;
  }

  .about-1-box p {
    padding: 0 20px;
  }

  input[type="email"], input[type="text"] {
    width: 100%;
    box-sizing: border-box;
  }
}