body {
  width: 100%;
  height: 100%;
  background-color: #ededed;
  margin: 0;
}
a {
  cursor: pointer;
  color: #000;
  text-decoration: none;
  outline: 0 none;
  -webkit-transition: all 0.2s linear;
  -moz-transition: all 0.2s linear;
  -ms-transition: all 0.2s linear;
  transition: all 0.2s linear;
}
.a1 {
  box-sizing: border-box;
  margin: 0 auto;
  max-width: 500px;
  padding: 5% 2%;
  position: relative;
  text-align: center;
}
.b1 {
  font-size: 18px;
  font-style: normal;
  font-weight: 700;
  line-height: 40px;
  color: #000;
}
.b2 {
  color: #313030;
  font-size: 12px;
  font-weight: 500;
  line-height: 25px;
}
.b3 {
  color: #f00;
  font-size: 15px;
  font-weight: 500;
  line-height: 25px;
}
.b4 {
  color: #2f00ff;
  font-size: 12px;
  font-weight: 500;
  line-height: 25px;
}
.c1 {
  background: linear-gradient(#eea70e, #ff430a);
  color: #fff;
  cursor: pointer;
  flex: 1 1;
  line-height: 40px;
  margin: 20px 0;
  padding: 0 10px;
  border-radius: 8px;
}