User:Irukaza/common.css

.mw-editform #wpTextbox1 {
    margin: 0;
    display: block;
    max-height: 100vh;
    min-height: 5em;
}
#wpTextbox1 {
    line-height: 1.5em;
    resize: vertical;
}
#editform, #toolbar, #wpTextbox1 {
    clear: both;
}
<style>
.wikiEditor-ui textarea {
    width: 100%;
    border: 0;
}
textarea[dir='ltr'], input[dir='ltr'] {
    direction: ltr;
}
.sitedir-ltr textarea, .sitedir-ltr input {
    direction: ltr;
}
.mw-editfont-monospace, .mw-editfont-sans-serif, .mw-editfont-serif {
    font-size: 13px;
}
.mw-editfont-monospace {
    font-family: monospace,monospace;
}
textarea {
    border: 1px solid #c8ccd1;
}
textarea {
    width: 100%;
    padding: 0.1em;
    display: block;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}