.mce-resizehandle-close {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  width: 10px;
  height: 10px;
  margin: 0;
  padding: 0;
  background-color: #ff4d4f;
  position: absolute;
  z-index: 1298;
  cursor: pointer;
}
.mce-resizehandle-close::before {
  content: '';
  position: absolute;
  top: 4px;
  left: 1px;
  width: 8px;
  height: 2px;
  background-color: #ffffff;
  -webkit-transform: rotateZ(45deg);
          transform: rotateZ(45deg);
}
.mce-resizehandle-close::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 1px;
  width: 8px;
  height: 2px;
  background-color: #ffffff;
  -webkit-transform: rotateZ(-45deg);
          transform: rotateZ(-45deg);
}