.flex-box {
  display: flex;
  width: 100%;
}

.flex-box img {
  width: 100%;
}

.box-w65 {
  position: relative;
  width: 65%;
  height: 100%;
}

.box-w35 {
  position: relative;
  width: 35%;
  height: 100%;
}

.box-w20 {
  position: relative;
  width: 20%;
  height: 100%;
}

.box-w80 {
  position: relative;
  width: 80%;
  height: 100%;
  padding: 0 20px;
}

@media screen and ( max-width:768px) {

  .flex-box {
    display: block;
  }

  .box-w65 {
    width: 100%;
  }

  .box-w35 {
    width: 100%;
  }

  .box-w20 {
    width: 100%;
  }

  .box-w80 {
    width: 100%;
    padding: 0;
  }

}