.dropdown {
  display: inline-block;

  > .button {
    width: 100%;
    height: 100%;
    padding: 0;

    cursor: pointer;

    color: white;
    border: none;

    font-size: 16px;

    img {
      max-width: 100%;
      max-height: 100%;
    }
  }

  > .content {
    position: absolute;
    z-index: 1;

    display: none;

    background-color: #F9F9F9;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);

    > a {
      display: block;

      padding: .75rem 1rem;

      text-decoration: none;

      color: black;

      &:hover {
        background-color: #F1F1F1;
      }
    }
  }

  &:hover {
    > .content {
      display: block;
    }

    > .button {
      background-color: #EAEAEA;
    }
  }
}

.dropdown {
  display: inline-block;

  > .button {
    width: 100%;
    height: 100%;
    padding: 0;

		background-color: white;

    cursor: pointer;

    color: white;
    border: none;

    font-size: 16px;

    img {
      max-width: 100%;
      max-height: 100%;
    }
  }

  > .content {
    position: absolute;
    z-index: 1;

    display: none;

    background-color: #F9F9F9;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);

    > a {
      display: block;

      padding: .75rem 1rem;

      text-decoration: none;

      color: black;

      &:hover {
        background-color: #F1F1F1;
      }
    }
  }

  &:hover {
    > .content {
      display: block;
    }

    > .button {
      background-color: #EAEAEA;
    }
  }
}

Make dropdown button background white by default
Make dropdown button background white by default
