#yammer-feed {
  border: solid 1px #DDD;
  @include border-radius(0 0 4px 4px);

  .ymodule-attachments {
    display: none;
  }

  .yj-ft {
    @include border-radius(0 0 4px 4px);
    padding: 10px 10px 0 10px;
  }

  .yj-first-message {
    border-top: 0;
    margin-top: 0;
  }

  .yj-last-message {
    border-bottom: 0;
    padding-bottom: 0;
  }

  .yj-auto-width-wrapper-span {
    padding: 0;
    margin: 0;

    .yj-callout-bar-entry-container {
      @include fill-parent;
      margin: 0;
      padding: 0;

      .yj-callout-bar-entry-field {
        background-image: none;
        border: 0;
        @include box-shadow(none);
        color: #000;
        padding: 0 0 0 10px;
      }
    }
  }
}

.yj-ta {
  .yj-ta-heading {
    div.head {
      display: none;
    }
  }
}

#yammer-feed {
  border: solid 1px #DDD;
  @include border-radius(0 0 4px 4px);

  .ymodule-attachments {
    display: none;
  }

  .yj-ft {
    @include border-radius(0 0 4px 4px);
    padding: 10px 10px 0 10px;
  }

  .yj-first-message {
    border-top: 0;
    margin-top: 0;
  }

  .yj-last-message {
    border-bottom: 0;
    padding-bottom: 0;
  }

  .yj-auto-width-wrapper-span {
    padding: 0;
    margin: 0;

    .yj-callout-bar-entry-container {
      @include fill-parent;
      margin: 0;
      padding: 0;

      .yj-callout-bar-entry-field {
        background-image: none;
        border: 0;
        @include box-shadow(none);
        color: #000;
        padding: 0 0 0 10px;

        &:-moz-placeholder {
          color: #bbb !important;
        }

        &:-ms-input-placeholder {
          color: #bbb !important;
        }
      }
    }
  }
}

.yj-ta {
  .yj-ta-heading {
    div.head {
      display: none;
    }
  }
}

Fix placeholder color in FF and IE10
Fix placeholder color in FF and IE10
