fuse-angular/src/assets/angular-material-examples/form-field-custom-control/form-field-custom-control-example.css

div {
    display: flex;
}

input {
    border: none;
    background: none;
    padding: 0;
    outline: none;
    font: inherit;
    text-align: center;
}

span {
    opacity: 0;
    transition: opacity 200ms;
}

:host.floating span {
    opacity: 1;
}