/* 全体の設定 */
a:hover {
  color: darkgray;
}

a {
  color: darkgray;
}


/*左に緑の見出し*/
.leftGreen {
  position: relative;
  padding: .25em 0 .5em .75em;
  border-left: 6px solid green;
}
.leftGreen::after {
  position: absolute;
  left: 0;
  bottom: 0;
  content: '';
  width: 40%;
  height: 0;
  border-bottom: 1px solid #7d997c;
}

/*左にグレーの見出し*/
.leftGray {
  position: relative;
  padding: .25em 0 .5em .75em;
  border-left: 6px solid gray;
}
.leftGray::after {
  position: absolute;
  left: 0;
  bottom: 0;
  content: '';
  width: 40%;
  height: 0;
  border-bottom: 1px solid #bbbbbb;
}

.grammar {
  position: relative;
  display: inline-block;
  margin: 1.5em 0;
  padding: 20px 15px 15px 10px;
  max-width: 95%;
  color: gray;
  font-size: 20px;
  font-weight: bold;
  background: rgb(254, 254, 254);
  border: solid 3px gray;
  box-sizing: border-box;
  border-radius: 30px;
}

.grammar p {
  margin: 0;
  padding: 0;
}

.sheet {
  max-width: 95%;
  margin:50px 0 50px;
  padding: 30px;
  background-color: #fff;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}