html {
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

body {
    margin: 0;
    background-color: #ffffff;
}

div {
    position: absolute;
}

nav {
    height: 48px;
    width: 100%;
    text-align: center;
}

.icon {
    width: 100%;
    margin: 10px 10px 0 0;
    vertical-align: center;
    text-align: center;
}

iframe {
    position: absolute;
    height: calc(100% - 48px);
    width: 100%;
    border: none;
    overflow: hidden;
    overflow-y: auto;
}