#app {
  border: 0;
  margin: 0;
  padding: 0;
}

body,
div {
  border: 0;
  margin: 0;
  padding: 0;
}

.app__width {
  width: 750px;
}

.app__inner {
  margin: 20px;
}


.app__bgc {
  position: fixed;
  background-color: #ffffff;
  width: 100%;
  height: 100%;
}

.app__bg {
  position: absolute;
  width: 100%;
  height: 100%;
}

.app__top-shadow {
  position: fixed;
  width: 750px;
  height: 1px;
  box-shadow: 0px 4px 0.9px 0.1px rgba(6, 0, 1, 0.07);
  background-color: #ffffff;
}

.app__content {
  position: relative;
}


.box {
  @extend .bb;
  @extend .shadow;
  position: relative;
  width: $contentWid;
  margin: 24px auto;
  position: relative;
  background-color: #fff;
  border-radius: 10px;
  padding: 28px 24px;
}