.input-group-addon {
    padding: 0.65rem 0.75rem;
    margin-bottom: 0;
    font-size: 0.875rem;
    font-weight: normal;
    line-height: 1.25;
    color: #495057;
    text-align: center;
    background-color: #fff;
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-radius: 3px;
}

.form-control:focus, .dataTables_filter input:focus {
    color: #495057;
    background-color: #fff;
    border-color: #dcdfe2; 
    outline: none;
  }