.z_my{
    width: 100%;
    position: relative;
}
.z_my img{
    width: 100%;
}

.z_dingdan {
  width: fit-content; /* 64rpx → 64/7.5 */
   /* 32rpx */
  box-sizing: border-box;
  padding: 4.267vw; /* 32rpx */
  display: flex;
  justify-content: space-between;
  font-size: 4.267vw; /* 32rpx */
  color: #333;
  border-radius: 3.2vw; /* 24rpx */
  background: #fff;
  cursor: pointer;
  position: fixed;
  right: 4vw;
  bottom: 6vw;
  z-index: 9;
  border: 1px solid;
}