HTML Print format previews well, but PDF generation is apparently ignoring any CSS

ERPNext
2

I assume you are trying to use flex. You will need to prefix your CSS as wkhtmltopdf does not support latest CSS.

Like this;

.flex {
    display: -webkit-box;
    display: -webkit-flex;
    display: -moz-box;
    display: -ms-flexbox;
    display: flex;
}

.inline-flex {
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -moz-inline-box;
    display: -ms-inline-flexbox;
    display: inline-flex;
}

.flex-row {
    -webkit-box-orient: horizontal;
    -webkit-box-direction: normal;
    -webkit-flex-direction: row;
       -moz-box-orient: horizontal;
       -moz-box-direction: normal;
        -ms-flex-direction: row;
            flex-direction: row;
}

.flex-row-reverse {
    -webkit-box-orient: horizontal;
    -webkit-box-direction: reverse;
    -webkit-flex-direction: row-reverse;
       -moz-box-orient: horizontal;
       -moz-box-direction: reverse;
        -ms-flex-direction: row-reverse;
            flex-direction: row-reverse;
}

.flex-column {
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
       -moz-box-orient: vertical;
       -moz-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
}

.flex-column-reverse {
    -webkit-box-orient: vertical;
    -webkit-box-direction: reverse;
    -webkit-flex-direction: column-reverse;
       -moz-box-orient: vertical;
       -moz-box-direction: reverse;
        -ms-flex-direction: column-reverse;
            flex-direction: column-reverse;
}

.flex-wrap {
    -webkit-flex-wrap: wrap;
        -ms-flex-wrap: wrap;
            flex-wrap: wrap;
}

.flex-wrap-reverse {
    -webkit-flex-wrap: wrap-reverse;
        -ms-flex-wrap: wrap-reverse;
            flex-wrap: wrap-reverse;
}

.flex-nowrap {
    -webkit-flex-wrap: nowrap;
        -ms-flex-wrap: nowrap;
            flex-wrap: nowrap;
}

.flex-justify-start {
    -webkit-box-pack: start;
    -webkit-justify-content: flex-start;
       -moz-box-pack: start;
        -ms-flex-pack: start;
            justify-content: flex-start;
}

.flex-justify-end {
    -webkit-box-pack: end;
    -webkit-justify-content: flex-end;
       -moz-box-pack: end;
        -ms-flex-pack: end;
            justify-content: flex-end;
}

.flex-justify-center {
    -webkit-box-pack: center;
    -webkit-justify-content: center;
       -moz-box-pack: center;
        -ms-flex-pack: center;
            justify-content: center;
}

.flex-justify-between {
    -webkit-box-pack: justify;
    -webkit-justify-content: space-between;
       -moz-box-pack: justify;
        -ms-flex-pack: justify;
            justify-content: space-between;
}

.flex-justify-around {
    -webkit-justify-content: space-around;
        -ms-flex-pack: distribute;
            justify-content: space-around;
}

.flex-justify-evenly {
    -webkit-box-pack: space-evenly;
    -webkit-justify-content: space-evenly;
       -moz-box-pack: space-evenly;
        -ms-flex-pack: space-evenly;
            justify-content: space-evenly;
}

.flex-align-start {
    -webkit-box-align: start;
    -webkit-align-items: flex-start;
       -moz-box-align: start;
        -ms-flex-align: start;
            align-items: flex-start;
}

.flex-align-end {
    -webkit-box-align: end;
    -webkit-align-items: flex-end;
       -moz-box-align: end;
        -ms-flex-align: end;
            align-items: flex-end;
}

.flex-align-center {
    -webkit-box-align: center;
    -webkit-align-items: center;
       -moz-box-align: center;
        -ms-flex-align: center;
            align-items: center;
}

.flex-align-baseline {
    -webkit-box-align: baseline;
    -webkit-align-items: baseline;
       -moz-box-align: baseline;
        -ms-flex-align: baseline;
            align-items: baseline;
}

.flex-align-stretch {
    -webkit-box-align: stretch;
    -webkit-align-items: stretch;
       -moz-box-align: stretch;
        -ms-flex-align: stretch;
            align-items: stretch;
}

.flex-content-start {
    -webkit-align-content: flex-start;
        -ms-flex-line-pack: start;
            align-content: flex-start;
}

.flex-content-end {
    -webkit-align-content: flex-end;
        -ms-flex-line-pack: end;
            align-content: flex-end;
}

.flex-content-center {
    -webkit-align-content: center;
        -ms-flex-line-pack: center;
            align-content: center;
}

.flex-content-between {
    -webkit-align-content: space-between;
        -ms-flex-line-pack: justify;
            align-content: space-between;
}

.flex-content-around {
    -webkit-align-content: space-around;
        -ms-flex-line-pack: distribute;
            align-content: space-around;
}

.flex-content-stretch {
    -webkit-align-content: stretch;
        -ms-flex-line-pack: stretch;
            align-content: stretch;
}

/* Flex Items */
.flex-self-auto {
    -webkit-align-self: auto;
        -ms-flex-item-align: auto;
                -ms-grid-row-align: auto;
            align-self: auto;
}

.flex-self-start {
    -webkit-align-self: flex-start;
        -ms-flex-item-align: start;
            align-self: flex-start;
}

.flex-self-end {
    -webkit-align-self: flex-end;
        -ms-flex-item-align: end;
            align-self: flex-end;
}

.flex-self-center {
    -webkit-align-self: center;
        -ms-flex-item-align: center;
                -ms-grid-row-align: center;
            align-self: center;
}

.flex-self-baseline {
    -webkit-align-self: baseline;
        -ms-flex-item-align: baseline;
            align-self: baseline;
}

.flex-self-stretch {
    -webkit-align-self: stretch;
        -ms-flex-item-align: stretch;
                -ms-grid-row-align: stretch;
            align-self: stretch;
}

.flex-grow-0 {
    -webkit-box-flex: 0;
    -webkit-flex-grow: 0;
       -moz-box-flex: 0;
        -ms-flex-positive: 0;
            flex-grow: 0;
}

.flex-grow-1 {
    -webkit-box-flex: 1;
    -webkit-flex-grow: 1;
       -moz-box-flex: 1;
        -ms-flex-positive: 1;
            flex-grow: 1;
}

.flex-shrink-0 {
    -webkit-flex-shrink: 0;
        -ms-flex-negative: 0;
            flex-shrink: 0;
}

.flex-shrink-1 {
    -webkit-flex-shrink: 1;
        -ms-flex-negative: 1;
            flex-shrink: 1;
}

.flex-basis-auto {
    -webkit-flex-basis: auto;
        -ms-flex-preferred-size: auto;
            flex-basis: auto;
}

.flex-basis-0 {
    -webkit-flex-basis: 0;
        -ms-flex-preferred-size: 0;
            flex-basis: 0;
}

.flex-basis-25 {
    -webkit-flex-basis: 25%;
        -ms-flex-preferred-size: 25%;
            flex-basis: 25%;
}

.flex-basis-50 {
    -webkit-flex-basis: 50%;
        -ms-flex-preferred-size: 50%;
            flex-basis: 50%;
}

.flex-basis-75 {
    -webkit-flex-basis: 75%;
        -ms-flex-preferred-size: 75%;
            flex-basis: 75%;
}

.flex-basis-100 {
    -webkit-flex-basis: 100%;
        -ms-flex-preferred-size: 100%;
            flex-basis: 100%;
}

.flex-order-0 {
    -webkit-box-ordinal-group: 1;
    -webkit-order: 0;
       -moz-box-ordinal-group: 1;
        -ms-flex-order: 0;
            order: 0;
}

.flex-order-1 {
    -webkit-box-ordinal-group: 2;
    -webkit-order: 1;
       -moz-box-ordinal-group: 2;
        -ms-flex-order: 1;
            order: 1;
}

.flex-order-2 {
    -webkit-box-ordinal-group: 3;
    -webkit-order: 2;
       -moz-box-ordinal-group: 3;
        -ms-flex-order: 2;
            order: 2;
}

.flex-order-3 {
    -webkit-box-ordinal-group: 4;
    -webkit-order: 3;
       -moz-box-ordinal-group: 4;
        -ms-flex-order: 3;
            order: 3;
}

.flex-order-4 {
    -webkit-box-ordinal-group: 5;
    -webkit-order: 4;
       -moz-box-ordinal-group: 5;
        -ms-flex-order: 4;
            order: 4;
}

.flex-order-5 {
    -webkit-box-ordinal-group: 6;
    -webkit-order: 5;
       -moz-box-ordinal-group: 6;
        -ms-flex-order: 5;
            order: 5;
}

.flex-order-last {
    -webkit-box-ordinal-group: 1000;
    -webkit-order: 999;
       -moz-box-ordinal-group: 1000;
        -ms-flex-order: 999;
            order: 999;
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