お問い合わせありがとうございました

.menu-btn {
position: fixed;
top: 10px;
right: 10px;
display: flex;
height: 60px;
width: 60px;
justify-content: center;
align-items: center;
z-index: 90;
background-color: #3584bb;
}
.menu-btn span,
.menu-btn span:before,
.menu-btn span:after {
content: '';
display: block;
height: 3px;
width: 25px;
border-radius: 3px;
background-color: #ffffff;
position: absolute;
}
.menu-btn span:before {
bottom: 8px;
}
.menu-btn span:after {
top: 8px;
}