drupal/core/themes/seven/install-page.css

/**
 * @file
 * Installation styling.
 *
 * Unfortunately we have to make our styling quite strong, to override the
 * .in-maintenance styling.
 */
.install-background {
  background-color: #1275b2;
  background-image:
    url('images/noise-low.png'),
    -webkit-radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
  background-image:
    url('images/noise-low.png'),
    -moz-radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
  background-image:
    url('images/noise-low.png'),
    -o-radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
  background-image:
    url('images/noise-low.png'),
    radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
  background-repeat: repeat;
  background-position: left top, 50% 50%;
  min-height: 100%;
}
.install-page {
  background: none;
}
.name-and-slogan h1 {
  font-size: 2em;
  line-height: 1.2em;
  color: #0074bd;
}

/**
 * Layout
 */
.install-page .l-container {
  background: #fff;
  width: auto;
  margin-left: 1.25em;
  margin-right: 1.25em;
}
.install-page .l-container:after { /* no reason for a clearfix in the markup */
  content: "";
  display: table;
  clear: both;
}
@media all and (max-width: 48em) { /* 768px */
  .install-page .l-container {
    margin-top: 1.25em;
    padding: 10px 20px 0;
  }
  .install-page .name-and-slogan {
    margin: 0 0 1.45em 0;
  }
}

@media all and (min-width: 48em) { /* 768px */
  html {
    display: table;
  }
  .install-page {
    display: table-cell;
    padding: 1em 0;
    vertical-align: middle;
  }
  html, .install-page {
    margin: 0;
    width: 100%;
    height: 100%;
  }
  .install-page .l-container {
    margin: 0 auto;
    max-width: 770px;
    width: 75%;
    border-radius: 5px;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
    padding: 20px 0 40px 0;
  }

  /* Positioning sidebar & content */
  .install-page [role="main"] {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    clear: none;
    float: left;
    padding-left: 3.85em;
    padding-right: 3.85em;
    width: 65%;
  }
  [dir="rtl"] .install-page [role="main"] {
    float: right;
  }
  ul {
    padding: 15px;
    margin: 0.25em 0;
  }
  .install-page .l-sidebar-first {
    float: left;
    width: 35%;
  }
  [dir="rtl"] .install-page .l-sidebar-first {
    float: right;
  }

  /* Margins for sitename */
  .install-page .name-and-slogan h1 {
    margin: 0.75em 0 0.75em 1.9em; /* LTR */
  }
  [dir="rtl"] .install-page .name-and-slogan h1 {
    margin: 0.75em 1.9em 0.75em 0;
  }
}

/**
 * Task list & step indicator
 */
@media all and (max-width: 48em) { /* 768px */
  header[role="banner"] {
    position: relative;
  }
  .step-indicator {
    display: block;
    font-size: 1.385em;
    position: absolute;
    top: 0.2em;
    right: 0.5em;
  }
  [dir="rtl"] .step-indicator {
    left: 2em;
    right: auto;
  }
  .install-task-list {
    display: none;
  }
}

@media all and (min-width: 48em) { /* 768px */
  .step-indicator {
    display: none;
  }
  .install-task-list {
    margin-left: 0; /* LTR */
    list-style-type: none;
    list-style-image: none;
    padding-left: 0; /* LTR */
    padding-bottom: 1em;
  }
  [dir="rtl"] .install-task-list {
    margin-right: 0;
    padding-right: 0;
  }
  .install-task-list li {
    padding: 0.5em 1em 0.5em 3.85em; /* LTR */
    color: #1a1a1a;
  }
  [dir="rtl"] .install-task-list li {
    padding: 0.5em 1em 0.5em 1em;
  }
  .install-task-list .active {
    background: #ebeae4;
    position: relative;
    font-weight: normal;
  }
  .install-task-list .active:after {
    left: 100%; /* LTR */
    border: solid transparent;
    border-color: rgba(235, 234, 228, 0);
    border-left-color: #ebeae4; /* LTR */
    border-width: 1.35em;
    content: " ";
    height: 0;
    width: 0;
    position: absolute;
    pointer-events: none;
    top: 50%;
    margin-top: -1.32em;
  }
  [dir="rtl"] .install-task-list .active:after {
    left: auto;
    right: 100%;
    border-left-color: transparent;
    border-right-color: #ebeae4;
  }
  .install-task-list .done {
    color: #adadad;
  }
}

/**
 * Password widget
 */
.install-page .password-parent,
.install-page .confirm-parent {
  width: auto;
}
.install-page .form-item .password-suggestions {
  float: none;
  width: auto;
}
@media all and (max-width: 1010px) and (min-width: 48em) {
  .install-page .password-strength,
  .install-page .confirm-parent,
  .install-page .password-confirm {
    float: none;
    width: auto;
  }
  input.password-confirm,
  input.password-field {
    float: none;
  }
}