riot-web/res/css/views/dialogs/_ExportDialog.scss

.mx_ExportDialog {
    .mx_ExportDialog_subheading {
        font-size: $font-16px;
        display: block;
        font-family: $font-family;
        font-weight: $font-semi-bold;
        color: $primary-fg-color;
        margin-top: 18px;
        margin-bottom: 12px;
    }

    &.mx_ExportDialog_Exporting .mx_ExportDialog_options {
        pointer-events: none;
    }

    .mx_ExportDialog_progress {
        .mx_Dialog_buttons {
            margin-top: unset;
            margin-left: 18px;
        }
        .mx_ExportDialog_spinner {
            animation: mx_rotate 2s linear infinite;
            z-index: 2;
            position: relative;
            margin-right: 10px;
            width: 24px;
            height: 24px;
            & .mx_ExportDialog_spinner_path {
                stroke: #0dbd8b;
                stroke-linecap: round;
                animation: mx_dash 1.5s ease-in-out infinite;
            }
        }
        display: flex;
        flex-direction: row;
        justify-content: flex-end;
        align-items: center;
    }

    .mx_RadioButton > .mx_RadioButton_content {
        margin-top: 5px;
        margin-bottom: 5px;
    }

    .mx_Field {
        width: 256px;
    }

    .mx_Field_postfix {
        padding: 9px 10px;
    }
}

@keyframes mx_rotate {
    100% {
        transform: rotate(360deg);
    }
}

@keyframes mx_dash {
    0% {
        stroke-dasharray: 1, 150;
        stroke-dashoffset: 0;
    }
    50% {
        stroke-dasharray: 90, 150;
        stroke-dashoffset: -35;
    }
    100% {
        stroke-dasharray: 90, 150;
        stroke-dashoffset: -124;
    }
}