OpenDroneMap-WebODM/app/static/app/js/css/AssetDownloadButtons.scss

.asset-download-buttons{
    display: inline-block;
    button{
        margin-right: 0 !important;
        i{
            left: 2px;
        }
    }

    &.btn-group{
        button{
            i{
                left: auto;
            }
        }
    }
}