body{
  margin:0;
  background:#eaeaea;
  display:flex;
  justify-content:center;
  align-items:center;
  height:100vh;
  font-family:Arial;
}

/* CONTENEDOR PRINCIPAL */
.carnet{
  width:400px;
  height:700px;
  background:linear-gradient(to bottom, #ffffff 55%, #ffb3b3 100%);
  border:2px solid red;
  box-sizing:border-box;
  position:relative;
  text-align:center;
  overflow:hidden;
}

/* FRANJA AZUL SUPERIOR */
.carnet::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:180px;
  background:#9fe3ff;
  z-index:0;
}

/* CURVA AMARILLA */
.carnet::after{
  content:"";
  position:absolute;
  top:130px;
  left:-10%;
  width:120%;
  height:90px;
  background:linear-gradient(to bottom, #f6e27a 60%, #ffffff 100%);
  border-radius: 0 0 100% 100%;
  z-index:1;
}

/* LOGO */
img{
  width:120px;
  height:120px;
  border-radius:50%;
  margin:30px auto 10px;
  position:relative;
  z-index:2;
}

/* NOMBRE INSTITUCIÓN */
.institucion{
  font-size:22px;
  font-weight:bold;
  margin:20px 20px 40px;
  position:relative;
  z-index:2;
}

/* CAJA DE SUSPENSIÓN */
.mensaje{ 
  position:absolute; 
  top:40%;
  left:0; 
  width:100%; 
  text-align:center; 
  font-size:32px; 
  font-weight:bold; 
  color:red; 
  transform:rotate(-10deg); 
}

/* ICONO DE ALERTA */
.mensaje img{
  width:100px;
  height:100px;
}