html,
body {
  width: 100vw !important;
  height: 100vh;
  padding: 0 !important;
  margin: 0 !important;
  overflow: hidden;
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    Segoe UI,
    Roboto,
    Helvetica Neue,
    Arial,
    sans-serif;
  font-size: 14px;
  border-radius: 0;
}

html {
  line-height: 1.15;
}

img {
  user-select: none;
  border-style: none;
  -webkit-user-drag: none;
  -moz-user-drag: none;
  -ms-user-drag: none;
}

button {
  padding: 0;
  margin: 0;
  cursor: pointer; /* 去除背景 */
  background: none;
  border: none; /* 去除边框 */
  outline: none; /* 去除点击时的轮廓 */
  box-shadow: none; /* 去除阴影 */
}

button,
input,
optgroup,
select,
textarea {
  margin: 0;
  font-family: inherit;
  font-size: 100%;
  line-height: 1.15;
}

button,
select {
  text-transform: none;
}

button::-moz-focus-inner,
[type='button']::-moz-focus-inner,
[type='reset']::-moz-focus-inner,
[type='submit']::-moz-focus-inner {
  padding: 0;
  border-style: none;
}

button:-moz-focusring,
[type='button']:-moz-focusring,
[type='reset']:-moz-focusring,
[type='submit']:-moz-focusring {
  outline: none;
}

fieldset {
  padding: 0.35em 0.75em 0.625em;
}

legend {
  box-sizing: border-box;
  display: table;
  max-width: 100%;
  padding: 0;
  color: inherit;
  white-space: normal;
}

progress {
  vertical-align: baseline;
}

[type='number']::-webkit-inner-spin-button,
[type='number']::-webkit-outer-spin-button {
  height: auto;
}

table {
  height: 100%;
}

html,
body,
a,
header,
textarea,
span,
input,
button,
ul,
li,
i,
h1,
h2,
h3,
h4,
h5,
h6,
div {
  box-sizing: border-box;
  user-select: none;
}

a {
  text-decoration: none;
}

h1,
h2,
h3,
h4,
h5,
h6,
dl,
p,
ol,
ul {
  padding: 0;
  margin: 0;
}

li {
  list-style: none;
}

:focus {
  outline: none;
}
