html {
  font-size: 16px;
  position: relative;
  min-height: 100%;
}

.nav-item {
  margin-left: 10px;
}

body {
  margin-bottom: 60px;
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
}

div {
  margin: 0 auto;
}

a {
  line-height: 1.5em;
}

.message {
  padding: 0;
  margin: 0;
}

.link {
  margin: 10px auto;
}

.button {
  text-align: center;
  margin: 20px auto;
}

.table {
  font-size: 14px;
}

.table-title {
  font-size: 10px;
}

.main {
  width: 100%;
  margin: 20px auto;
}

.tablesorter-headerUnSorted {
  background-image: url(../images/sort.png);
  background-size: 10px;
  background-repeat: no-repeat;
  background-position: center right;
  cursor: pointer;
}

.tablesorter-headerDesc {
  background-color: red;
  color: red;
  background-image: url(../images/sort_a.png);
  background-size: 10px;
  background-repeat: no-repeat;
  background-position: center right;
  cursor: pointer;
}

.tablesorter-headerAsc {
  background-color: blue;
  color: blue;
  background-image: url(../images/sort_b.png);
  background-size: 10px;
  background-repeat: no-repeat;
  background-position: center right;
  cursor: pointer;
}

.twitter {
  width: 100%;
  margin: 30px auto;
}

.twitter-share-button {
  margin-left: 10px;
}

@media screen and (min-width: 481px) {
  .main {
    width: 80%;
    margin: 20px auto;
  }

  .twitter {
    width: 80%;
    margin: 30px auto;
  }
}

@media screen and (min-width: 960px) {
  .main {
    width: 60%;
    margin: 20px auto;
  }

  .twitter {
    width: 40%;
    margin: 30px auto;
  }
}