article {
    width: 65%;
    float: left;
}

section#conact-popup {
    float: right;
    width: 248px;
    clear: none;
}

.stripe {
    overflow: hidden;
    padding: 55px 0;
}

@media screen and (max-width:1023px) {
  .stripe {
    padding: 45px 25px;
}
}

@media screen and (min-width:640px) and (max-width:1023px) {
  article {
      width: 54%;
      float: left;
  }
}

@media screen and (max-width:639px) {
  article {
    width: 100%;
    float: none;
}
  .stripe {
    padding: 35px 20px;
}
}