style.css

body {
  font-family: Arial, sans-serif;
}

#app {
  position: relative;
}

.window {
  position: absolute;
  width: 300px;
  height: 200px;
  background-color: #f0f0f0; /*Текст окна*/
  border: 1px solid #ccc; /*Грань окна*/
  box-shadow: 2px 2px 12px rgba(112, 75, 75, 0.2); /*Подсветка окна*/
  overflow: hidden;
}

.window-header {
  background-color: #333; /*заголовка цвет*/
  color: #fff; /*Цвет текста заголовка*/
  padding: 5px;
  cursor: move;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.window-content {
  padding: 10px;
  height: calc(100% - 30px);
  overflow-y: auto;
}

.window-minimized {
  height: 30px;
}

.window-button-close {
  background: none;
  border: none;
  color: rgb(231, 8, 8);
  cursor: pointer;
}
.window-button-toggle {
  background: none;
  border: none;
  color: rgb(216, 231, 8);
  cursor: pointer;
}
.window-resizer {
  width: 10px;
  height: 10px;
  background-color: #333;
  position: absolute;
  right: 0;
  bottom: 0;
  cursor: se-resize;
}