siyuan/app/src/assets/scss/_reset.scss

html {
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
  height: 100%;
  box-sizing: border-box;
}

body {
  text-rendering: optimizeLegibility;
  margin: 0;
  font-family: var(--b3-font-family);
  font-size: 14px;
  color: var(--b3-theme-on-background);
  background-color: var(--b3-theme-background);
  -webkit-font-smoothing: antialiased;
  -webkit-overflow-scrolling: touch;
  height: 100%;
  box-sizing: border-box;
  max-height: 100%;
  overflow: hidden;

  &.body--win32 {
    -webkit-font-smoothing: auto;
    border: 1px solid var(--b3-border-color);

    .toolbar {
      padding-left: 0;

      // https://github.com/siyuan-note/siyuan/issues/4460
      .b3-tooltips__se,
      .b3-tooltips__sw,
      .b3-tooltips__s {
        &:before {
          bottom: -15px;
        }

        &:after {
          top: calc(100% + 10px);
        }
      }
    }

    &.body--blur {
      border-top-color: var(--b3-theme-surface);
    }

    .fullscreen {
      & > .protyle-breadcrumb,
      & > .block__icons {
        padding-left: 8px;
        padding-right: 98px;
      }

      .protyle-breadcrumb > .fn__flex-shrink {
        -webkit-app-region: drag;
      }
    }
  }
}

ul,
ol {
  margin: 0;
  padding: 0;
}

h1,
h2,
h3,
h4,
h5,
h6,
dl,
dd,
p {
  margin: 0;
}

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
nav,
section {
  display: block;
}

audio,
canvas,
video {
  display: inline-block;
}

audio:not([controls]) {
  display: none;
}

a {
  outline: 0;
  text-decoration: none;
  color: var(--b3-theme-primary);
}

a:hover {
  text-decoration: underline;
}

sub,
sup {
  position: relative;
  font-size: 75%;
  line-height: 0;
  vertical-align: baseline;
}

sup {
  top: -0.5em;
}

sub {
  bottom: -0.25em;
}

img {
  max-width: 100%;
  vertical-align: middle;
  border: 0;
  height: auto;
  -ms-interpolation-mode: bicubic;
  overflow: hidden;
  font-size: 12px;
}

button,
input,
select,
textarea {
  margin: 0;
  font-size: 100%;
  vertical-align: middle;
  font-family: var(--b3-font-family);
  outline: none;
}

button,
input {
  line-height: normal;
}

button::-moz-focus-inner,
input::-moz-focus-inner {
  padding: 0;
  border: 0;
}

button,
input[type="button"],
input[type="reset"],
input[type="submit"] {
  cursor: pointer;
  -webkit-appearance: button;
}

input[type="search"] {
  box-sizing: content-box;
  -webkit-appearance: textfield;
}

input[type="search"]::-webkit-search-decoration,
input[type="search"]::-webkit-search-cancel-button {
  -webkit-appearance: none;
}

textarea {
  overflow: auto;
}

svg {
  fill: currentColor;
  display: inline-block;
}

line, circle {
  transition: fill .15s ease-in-out;
}

circle {
  cursor: pointer;
}

blockquote {
  margin: 0;
}