mail/src/sass/blocks/views/_write.scss

.write {
    position: relative;
    display: flex;
    flex-direction: column;

    @include respond-to(md) {
        height: 590px; // magic number: chosen to look good
    }

    // Header components

    &__header {
        flex-shrink: 0;
        margin-bottom: 1em;

        .mail-addresses {
            margin-bottom: 0.5em;
        }

        & > .attachments {
            margin-top: 0.5em;
        }
    }
    &__subject {
        position: relative;
        margin-top: 1.3em;

        input[type=file] {
            position: absolute;
            visibility: hidden;
            width: 0;
            height: 0;
        }
        .input-text {
            width: 100%;
            height: 40px;
            padding-right: 10px + 5px + 30px;
        }
        .btn {
            position: absolute;
            top: 5px;
            right: 5px;
            padding: 0;
            line-height: 30px;
            width: 30px;
            height: 30px;
            font-size: 1em;
            outline: 0;
            min-width: 0;
        }
    }

    // Content components

    &__body {
        flex-grow: 1;
        width: 100%;
        border: none;
        outline: none;
        color: $color-grey-dark;
        line-height: 1.5em;
        overflow-y: auto;
        // allow scrolling on iOS
        -webkit-overflow-scrolling: touch;
        // put layer on GPU
        transform: translatez(0);
    }
}