html {
  font-size: 20px;
}
@media only screen and (min-width: 400px) {
  html {
    font-size: 21.33333333px !important;
  }
}
@media only screen and (min-width: 414px) {
  html {
    font-size: 22.08px !important;
  }
}
@media only screen and (min-width: 480px) {
  html {
    font-size: 25.6px !important;
  }
}

@media only screen and (min-width: 320px) {
  html {
    font-size: 17.1px !important;
  }
}
@media only screen and (min-width: 375px) {
  html {
    font-size: 20px !important;
  }
}
@media only screen and (min-width: 768px) {
  html {
    font-size: 41px !important;
  }
}

.fixed_top {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
}

body {
  background-color: #e6e6e6;
}
.back-fff {
  background: #fff;
}