antd-mobile/es/components/floating-panel/floating-panel.css

<div align="center">

.adm-floating-panel {
  --border-radius: 8px;
  --header-height: 28px;
  --z-index: var(--adm-floating-panel-z-index, 900);
  position: fixed;
  z-index: var(--z-index);
  left: 0;
  width: 100vw;
  display: flex;
  flex-direction: column;
  touch-action: none;
}
.adm-floating-panel-mask {
  display: block;
  width: 100%;
  height: 100vh;
  position: absolute;
  left: 0;
  top: -100vh;
  background: transparent;
}
.adm-floating-panel::after {
  content: '';
  display: block;
  position: absolute;
  height: 100vh;
  width: 100vw;
  background: var(--adm-color-background);
}
.adm-floating-panel .adm-floating-panel-header {
  flex: none;
  height: var(--header-height);
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: -webkit-grab;
  cursor: grab;
  -webkit-user-select: none;
          user-select: none;
  background-color: var(--adm-color-background);
  border-top-left-radius: var(--border-radius);
  border-top-right-radius: var(--border-radius);
}
.adm-floating-panel .adm-floating-panel-header .adm-floating-panel-bar {
  height: 3px;
  width: 20px;
  border-radius: 10px;
  background: var(--adm-color-light);
}
.adm-floating-panel .adm-floating-panel-content {
  flex: 1;
  overflow-y: scroll;
  background: var(--adm-color-background);
}
.adm-floating-panel-top {
  top: 0;
}
.adm-floating-panel-top::after {
  top: -100vh;
}
.adm-floating-panel-bottom {
  bottom: 0;
}
.adm-floating-panel-bottom::after {
  bottom: -100vh;
}