<div class="position-fixed">fixedで固定</div>
<div class="block-red"></div>
<div class="block-blue"></div>
<div class="block-green"></div>
<div class="block-red"></div>
<div class="block-blue"></div>
<div class="block-green"></div>
.position-fixed {
position: fixed;
z-index: 1;
top: 0;
left: 0;
display: flex;
justify-content: center;
align-items: center;
width: 100%;
height: 100px;
background-color: #5CC0EF;
font-size: 32px;
letter-spacing: 0.05em;
color: white;
}
.block-red {
width: 100%;
height: 400px;
background-color: red;
}
.block-blue {
width: 100%;
height: 400px;
background-color: blue;
}
.block-green {
width: 100%;
height: 400px;
background-color: green;
}
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