<p id="" class="tooltip"> 説明文説明文説明文説明文説明文説明文説明文説明文説明文説明文説明文 </p>
p.tooltip{ margin: 0; padding: 10px; width: 250px; min-height: 30px; background-color: #DFF8FF; opacity: 1; border-radius: 5px; -moz-border-radius: 5px; color: #000; position: absolute; top: 100px; left: 20px; border: 5px solid #5DC7EB; } p.tooltip:before { border-top-width: 16px; border-right-width: 16px; border-bottom-width: 0; border-left-width: 16px; border-color: #5DC7EB transparent; border-style: solid; display: block; position: absolute; bottom: -16px; left: 116px; width: 0; height: 0; content: ""; } p.tooltip:after { border-top-width: 16px; border-right-width: 16px; border-bottom-width: 0; border-left-width: 16px; border-color: #DFF8FF transparent; border-style: solid; display: block; position: absolute; bottom: -10px; left: 116px; width: 0; height: 0; content: ""; }