初始化CSS

html {
    line-height: 1.15;
    -webkit-text-size-adjust: 100%
}

body {
    margin: 0
}

main {
    display: block
}

h1 {
    font-size: 2em;
    margin: 0.67em 0
}

hr {
    box-sizing: content-box;
    height: 0;
    overflow: visible
}

pre {
    font-family: monospace, monospace;
    font-size: 1em
}

a {
    background-color: transparent
}

abbr[title] {
    border-bottom: none;
    text-decoration: underline;
    text-decoration: underline dotted
}

b,
strong {
    font-weight: bolder
}

code,
kbd,
samp {
    font-family: monospace, monospace;
    font-size: 1em
}

small {
    font-size: 80%
}

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

sub {
    bottom: -0.25em
}

sup {
    top: -0.5em
}

img {
    border-style: none
}

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

button,
input {
    overflow: visible
}

button,
select {
    text-transform: none
}

button,
[type="button"],
[type="reset"],
[type="submit"] {
    -webkit-appearance: button
}

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

button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
    outline: 1px dotted ButtonText
}

fieldset {
    padding: 0.35em 0.75em 0.625em
}

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

progress {
    vertical-align: baseline
}

textarea {
    overflow: auto
}

[type="checkbox"],
[type="radio"] {
    box-sizing: border-box;
    padding: 0
}

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

[type="search"] {
    -webkit-appearance: textfield;
    outline-offset: -2px
}

[type="search"]::-webkit-search-decoration {
    -webkit-appearance: none
}

::-webkit-file-upload-button {
    -webkit-appearance: button;
    font: inherit
}

details {
    display: block
}

summary {
    display: list-item
}

template {
    display: none
}

[hidden] {
    display: none
}