* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  text-decoration: none;
}
.container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 10px;
}
.container > header {
  width: 100%;
  text-align: center;
  font-size: 20px;
  padding: 10px 10px 20px 10px;
  font-weight: 700;
}
.container > header span {
  color: green;
}
.container main {
  width: 100%;
}
.container main > .pic {
  width: 100%;
}
.container main > .pic img {
  width: 100%;
}
.container main > p {
  padding: 10px;
  color: #1C487F;
  font-size: 18px;
}
.container main > p .red {
  color: red;
}
.container main > p .green {
  color: green;
}
.container main > p .bold {
  font-weight: 700;
}
.container .footer {
  width: 96%;
  max-width: 800px;
  position: fixed;
  margin: 0 auto;
  left: 0;
  right: 0;
  bottom: 4px;
  text-align: center;
  padding: 10px;
  background-color: #1C487F;
  color: #fff;
  font-size: 20px;
  border-radius: 20px;
  animation: btn 1.6s infinite;
}
@media (max-width: 500px) {
  body .container main p {
    font-size: 16px;
  }
  body .container .footer {
    font-size: 16px;
  }
}
@keyframes btn {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
  100% {
    transform: translateY(0);
  }
}