_sass/2-base/_base.scss
*, *::after, *::before {
  box-sizing: border-box;
}

body {
  font-family: $base-font-family;
  font-size: $base-font-size;
  line-height: $base-line-height;
  color: $text-color;
  background-color: $background-color;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  input, textarea {
		border: 1px solid $border-color;
		outline: none;
		&:focus:required:invalid {
			border-color: #e02f40;
		}
		&:required:valid {
			border-color: #34a74e;
		}
	}
}

::placeholder {
	color: #666;
}

*::selection {
  color: $white;
  background-color: $dark;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: $heading-font-family;
  line-height: initial;
  letter-spacing: 0.5px;
}

h1 {
  font-size: $font-size-h1;
}

h2 {
  font-size: $font-size-h2;
}

h3 {
  font-size: $font-size-h3;
}

h4 {
  font-size: $font-size-h4;
}

h5 {
  font-size: $font-size-h5;
}

h6 {
  font-size: $font-size-h6;
}

blockquote {
  margin: 30px -100px;
  font-size: 28px;
  line-height: 45px;
  letter-spacing: 0.5px;
  font-style: normal;
  text-align: center;
  
  @media only screen and (max-width: $tablet) {
    margin: 30px 0;
    font-size: 24px;
    line-height: 38px;
  }
}

pre {
  overflow: auto;
  padding: 15px;
  margin-bottom: 0;
  font-size: 14px;
  white-space: pre-wrap;
  word-wrap: break-word;
  word-break: break-all;
}

img,
.zoom-img-wrap {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
  &+em {
    text-align: center;
    display: block;
    font-style: normal;
    font-weight: normal;
    font-size: 14px;
    color: $gray;
  }
}

a {
    text-decoration: none;
    color: $link-color;
    transition: $global-transition;
    &:hover {
      color: darken($link-color, 10%);
    }
    &:active {
      color: darken($link-color, 20%);
    }
}

hr {
  display: block;
  height: 1px;
  margin: 40px 0;
  border: 0;
  background: $light-gray;
}