Выравнивание элементов по центру
.some-class {
display: flex;
align-items: center;
justify-content: center;
}
.some-class {
position: absolute;
top: 50%;
left: 50%;
transform: translate (-50%, -50%);
}
body {
display: grid;
place-items: center;
height: 100vh;
}