body{
    background-color: lightgrey;
    background-image: url("img/fondo.jpg");
    background-size: cover;
    background-attachment: fixed;
    background-position: center center;
    width: 960px;
    margin: 0px auto;
    display: flex;
    justify-content: center;
    align-items: center;
}
h1{
    text-align: center;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    color: black;
    text-shadow: 2px 2px 2px blue;
}
.alertas{
    line-height: 15px;
}
.contenedor_alertas{
    -webkit-box-shadow: 10px 10px 5px 0px rgba(0,0,0,0.4);
    -moz-box-shadow: 10px 10px 5px 0px rgba(0,0,0,0.4);
    box-shadow: 10px 10px 5px 0px rgba(0,0,0,0.4);
    border-style: solid;
    border-width: 1px;
    border-radius: 15px;
    width: 750px; 
    height: 75px;
    padding: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    line-height: 1;

}
.alert-link{
    font-weight: bold;
}
.alerta-cuarta{
    color: rgb(8, 139, 58);
    background-color: rgba(142, 211, 168, 0.5);
}
.alerta-primera{
    color: lightcoral;
    background-color: rgba(240, 208, 224, 0.5);
}
.alerta-segunda{
    color: rgb(30, 27, 236);
    background-color: rgba(144, 176, 236, 0.5);
}
.alerta-tercera{
    color: rgb(8, 139, 58);
    background-color: rgba(142, 211, 168, 0.5);
}