body {
    background-color: #f9f4ef
}

h1 {
position: relative;
padding: 0.25em 0;
}
h1:after {
content: "";
display: block;
height: 4px;
background: -webkit-linear-gradient(to right, rgb(20, 34, 114), transparent);
background: linear-gradient(to right, rgb(20, 34, 114), transparent);
}

h2 {
    position: relative;
    padding: 0.5em;
    background: #001858;
    color: white;
    margin-top: 60px;
    margin-bottom: 30px;
  }
  
h2::before {
    position: absolute;
    content: '';
    top: 100%;
    left: 0;
    border: none;
    border-bottom: solid 15px transparent;
    border-right: solid 20px rgb(149, 158, 155);
}

h3 {
    background: linear-gradient(transparent 70%, #8bd3dd 70%);
    margin-top: 40px;
    margin-bottom: 30px;
    margin-left: 1%;
    margin-right: 1%;
}

.main_text {
    margin-left: 3%;
    margin-right: 3%;
}

.img {
    
}

p.img_center{
    text-align: center;
    margin-top: 40px;
    margin-bottom: 40px;
}

p.text_center{
    text-align: center;
    margin-top: 5px;
    margin-bottom: 5px;
}

p.daimei{
    text-align: center;
    margin-top: 60px;
    margin-bottom: 60px;
    font-size: 40px;
    font-weight: bold;
}

.head {
margin-bottom: 30px;
margin-left: 1%;
margin-right: 1%;
line-height: 1.5em;
}

.main {
margin-bottom: 30px;
margin-left: 2%;
margin-right: 2%;
line-height: 1.5em;
}

.tips {
    position: relative;
    margin: 2em 0;
    padding: 0.5em 1em;
    border: solid 3px #f582ae;
}
.tips .tips-title {
    position: absolute;
    display: inline-block;
    top: -27px;
    left: -3px;
    padding: 0 9px;
    height: 25px;
    line-height: 25px;
    font-size: 17px;
    background: #f582ae;
    color: #ffffff;
    font-weight: bold;
    border-radius: 5px 5px 0 0;
}
.tips p {
    margin: 0; 
    padding: 0;
}
  
h4 {
background: #fffffe;
box-shadow: 0px 0px 0px 10px #fffffe;/*線の外側*/
border: dashed 2px #f582ae;/*破線*/
border-radius: 9px;
margin-left: 10px;/*はみ出ないように調整*/
margin-right: 10px;/*はみ出ないように調整*/
padding: 0.5em 0.5em 0.5em 2em;
}

.btn-mac {
display: inline-block;
text-decoration: none;
background: #f09c9c;
color: #FFF;
width: 120px;
height: 120px;
line-height: 120px;
border-radius: 50%;
text-align: center;
font-weight: bold;
overflow: hidden;
box-shadow: 0px 2px 2px rgba(0, 0, 0, 0.29);
border-bottom: solid 3px #bb7474;
transition: .4s;
margin-right: 30px;
margin-left: 30px;
}

.btn-mac:active {
-webkit-transform: translateY(2px);
transform: translateY(2px);
box-shadow: 0 0 1px rgba(0, 0, 0, 0.15);
border-bottom: none;
}

.btn-win {
display: inline-block;
text-decoration: none;
background: #91c5f0;
color: #FFF;
width: 120px;
height: 120px;
line-height: 120px;
border-radius: 50%;
text-align: center;
font-weight: bold;
overflow: hidden;
box-shadow: 0px 2px 2px rgba(0, 0, 0, 0.29);
border-bottom: solid 3px #77abbb;
transition: .4s;
margin-right: 30px;
margin-left: 30px;
}

.btn-win:active {
-webkit-transform: translateY(2px);
transform: translateY(2px);
box-shadow: 0 0 1px rgba(0, 0, 0, 0.15);
border-bottom: none;
}