* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  background-color: #ffffff;
}

body {
  font-family: sans-serif;
  padding: 3em 2em 2em 2em;
  min-height: 100vh;
  overflow: hidden;
}

.landing {
  display: flex;
  flex-direction: column;
  align-items: center;         /* horizontal: centrado */
  justify-content: flex-start; /* vertical: arriba */
  height: calc(100vh - 4em);   /* resta padding superior e inferior */
  width: 100%;
}

.imagen {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  width: 100%;
  height: 100%;
}

.imagen img {
  max-width: 800px;            /* límite de ancho */
  width: 100%;                 /* escala con el contenedor */
  max-height: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  align-self: flex-start;
}