body {
    font-family: Arial;
    background-image:url("ecuacion.gif");
    margin: 0;
    padding: 0;

}
h1{
color:red;
}
.cuadrado {
    width:1200px;
    flex-direction:column;
    margin:40px;
    background-color: #B5F90D;
    border-width:20px;
    border-color:black;
    padding: 40px;
    border-radius: 8px;
    
}

button {
    background-color: #007BFF;
    color: #ffff;
    padding: 10px;
    border-radius: 4px;
    cursor: pointer;
}