.contact {
  overflow: hidden;
}

.sec1 {
  width: 100%;
  height: 160px;
  background: bottom/cover no-repeat url(../img/bg-ch.png);
  margin: 0 auto 80px;
}

@media only screen and (max-width: 575.98px) {
  .sec1 {
    height: 100px;
    margin: 0 auto 40px;
    background: none;
    position: relative;
  }
}

@media only screen and (max-width: 575.98px) {
  .sec1:before {
    content: "";
    position: absolute;
    left: calc((1100px - 100vw) / -2);
    top: -1000px;
    width: 1100px;
    height: 1100px;
    border-radius: 550px;
    background: linear-gradient(to right, #ff702c 0%, #ffb92d 100%);
    z-index: -4;
  }
}

.sec1 h1 {
  padding: 40px 0 0;
  text-align: center;
  font-size: 3.2rem;
  font-weight: bold;
  color: #fff;
}

@media only screen and (max-width: 575.98px) {
  .sec1 h1 {
    font-size: 2.4rem;
    padding: 20px 0 0;
  }
}

.sec1 h1 span {
  display: block;
  padding: 15px 0 0;
  text-align: center;
  font-size: 1.8rem;
  font-weight: bold;
  line-height: 1.5em;
}

@media only screen and (max-width: 575.98px) {
  .sec1 h1 span {
    font-size: 1.2rem;
    line-height: 1.2em;
    padding: 8px 0 0;
  }
}