Btw, if you also want to have what I got (better post box, post backgrounds based on visibility), this is the stylesheet I use:

.compose-form__dropdowns button,
.compose-form__buttons button.icon-button {
color: pink;
border-color: pink;
border-radius: 2px;
}

.compose-form__highlightable {
border-radius: 2px;
}

.compose-form__submit > .button {
background: pink;
color: white;
border-radius: 2px;
height: 2.5rem;
}

.status-unlisted,
.status__wrapper-unlisted {
background: #2e2e2e;
}

.status-private,
.status__wrapper-private{
background: #000033;
}
.status-direct,
.status__wrapper-direct {
background-color: #4400007f;
}
Base Color : 9F0379
Mode : monochrome-light
#111111
#1F1F1F
#2E2E2E
#3C3C3C
#8F056E
#AB0583
#C70598
#E405AD
#FA0BC0
Base Color : 2776B5
Mode : monochrome-light
#2E2E2E
#444444
#205F91
#2776B5
#328CD4
#55A0DC
Base Color : 0E16CD
Mode : monochrome-light
#2E2E2E
#3E3E3E
#4E4E4E
#0E14AD
#0F17CC
#111AEA
#2A33F1
#474FF3
Base Color : BC221F
Mode : monochrome-light
#2E2E2E
#3E3E3E
#4E4E4E
#A01E1B
#BC221F
#D82623
#E03E3A
#E55855
Base Color : 424466
Mode : monochrome-light
#141414
#2E2E2E
#383A56
#4B4E76
#5E6197
Base Color : 1F3773
Mode : monochrome-light
#090909
#1B1B1B
#2E2E2E
#1B3064
#233E82
#2A4B9F
#3058BD
Base Color : 915517
Mode : monochrome-light
#141414
#2E2E2E
#7B4814
#A7621A
#D57C20
Base Color : 9535A7
Mode : monochrome-light
#2E2E2E
#3C3C3C
#4B4B4B
#595959
#8B329C
#9F38B2
#B042C4
#B957CC
#C36CD3
Base Color : 0A9849
Mode : monochrome-light
#111111
#1F1F1F
#2E2E2E
#3C3C3C
#0A8A43
#0CA44F
#0DBF5C
#0EDB69
#15F076