html {
  font-family: $global-font-family;
  font-size: $global-font-size;
  font-weight: $global-font-weight;
  line-height: $global-line-height;
  width:100%;
}

/* scrollbar, only support webkit */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-thumb {
  background-color: $scrollbar-color;

  &:hover {
    background-color: $scrollbar-hover-color;
  }
}

::selection {
  background: $selection-color;

  .dark-theme & {
    background: $selection-color-dark;
  }
}

body {
  background-color: $global-background-color;
  color: $global-font-color;
  overflow-wrap: break-word;

  &::before {
    content: "";
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.05;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    -webkit-filter: grayscale(100%);
    -moz-filter: grayscale(100%);
    -ms-filter: grayscale(100%);
    -o-filter: grayscale(100%);
    filter: grayscale(100%);
    filter: gray;
  }

  &.dark-theme {
    color: $global-font-color-dark;
    background-color: $global-background-color-dark;
  }
}

b, strong {
  font-weight: bold;
}

a {
  color: $global-link-color;
  text-decoration: none;

  &:hover {
    color: $global-link-hover-color;
  }

  .dark-theme & {
    color: $global-link-color-dark;

    &:hover {
      color: $global-link-hover-color-dark;
    }
  }
}

b, strong {
  font-weight: bold;

  .dark-theme & {
    color: #ddd;
  }
}

#dynamic-to-top {
  display: none;
  overflow: hidden;
  width: auto;
  z-index: 100;
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  top: auto;
  left: auto;
  font-size: 1.4rem;
  line-height: 1.8rem;
  padding: .6rem .6rem;
  color: $global-font-secondary-color;
  background: $header-background-color;
  border: 1px solid $global-border-color;
  border-radius: 2rem;

  &:hover, &:active {
    color: $global-font-color;
    background: $global-background-color;
    cursor: pointer;
  }

  &:active, &:focus, &:hover {
    outline: none;
  }

  .dark-theme & {
    color: $global-font-secondary-color-dark;
    background: $header-background-color-dark;
    border-color: $global-border-color-dark;

    &:hover, &:active {
      color: $global-font-color-dark;
      background: $global-background-color-dark;
    }
  }
}