.bg_blue_white {
  background: -webkit-linear-gradient(90deg, #365caa, #fff 90%);
  background: -moz-linear-gradient(left, #365caa, #fff 90%);
  background: linear-gradient(90deg, #365caa, #fff 90%);
}
.button_box {
  background: #fff;
  color: #375dab;
  font-weight: 600;
  display: inline-flex;
  padding: 10px 20px;
  height: 50px;
  align-items: center;
  border-radius: 6px;
  font-size: 16px;
  position: relative;
}

  .button_box::after {
    content: "";
    position: absolute;
    left: 5px;
    top: 5px;
    width: 100%;
    height: 100%;
    border: 2px solid #fff;
    border-radius: inherit;
  }