style.css

/******************HTML**********************/
html {
    width: 100%;
}

img {
    width: 80%;
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
    }
input[type=number] { -moz-appearance:textfield; }

/******************header****************************/
header {
    text-align: center;
}
img{
    height: 20rem;
    border-radius: 2rem;
}
/**********************main***************************/
h1{
    text-align: center;
    margin: 0;
    color: brown;
}
legend {
    font-size: 1.65rem;
    color: #332c2c;
}

label {
    display: block;
    font-size: 1.3rem;
    margin-left: 10%;
}

fieldset{
    margin: 0;
    max-width: 50%;
    margin-left: 24%;
}

input {
    font-size: 1rem;
    padding: .5rem;
    display: block;
    width: 80%;
    background-color: #e1e1e1;
    margin-left: 2%;
    margin-bottom: .8rem;
    border: none;
    border-radius: 1rem;
}

button{
    background-color: rgb(39, 207, 39);
    color: white;
    font-size: 1rem;
    padding: .8rem;
    border: none;
    border-radius: 1rem;
    margin-left: 10%;
    text-transform: uppercase;
}

button:hover{
    opacity: .8;
    color: rgb(19, 53, 206);
}
body{
    margin-top: 0;
}
/**********************************/
.contenido-flex {
    width: 100%;
    display: flex;
}
.contenido-formulario {
    width: 40%;
}
.contenido-resultado{
    width: 60%;
    text-align: center;
    font-size: 2.5rem;
}

/*****footer*****/
.footer{
    text-align: left;
    font-weight: 900;
    color: black;
    left:0;
    bottom:0;
    height:3rem;
    width:100%;
}
.derechos{
    margin-left: 3%;
}
.enlace {
    color: black;
    text-decoration: none;
}
.enlace:hover{
    color: rgb(5, 134, 255);
}
/************************/
@media (height:665px){
    
    body{
        margin: 0;
    }
    img{
        width: 90%;
        height: 15.99rem;
    }
    .footer {
        position: relative;
        margin: 0;
    }
}
/*****************************************************/
@media (max-width :500px){
    body{
        background-color: rgb(241, 241, 241);
    }
    img {
        max-width: 80%;
        height: 15rem;
        border-radius: 1rem;
    }
    h1{
        margin: .5rem;
        font-size: 1.3rem;
    }
    fieldset{
        margin: 0;
        margin-left: 1rem;
        min-width: 85%;
        min-height: 18rem;
    }
    legend{
        font-size: 1.2rem;
    }
    button {
        background-color: rgba(15, 139, 211, 0.877);
        border-radius: 2rem;
        margin: 0;
    }
    input {
        font-size: .95rem;
        padding: .7rem;
        display: block;
        width: 80%;
        background-color: #e1e1e1;
        margin-bottom: .5rem;
        border: none;
        border-radius: .8rem;
    }

    .contenido-flex {
        width: 100%;
        display: flex;
        flex-basis: calc(40% - 2rem);
    }
    .contenido-formulario {
        width: 50%;
    }
    .contenido-resultado{
        width: 50%;
        text-align: center;
        font-size: 1.8rem;
    }



}

@media (min-width: 501px) and (max-width: 800px){
    body{
        background-color: rgb(241, 241, 241);
    }
    img {
        max-width: 80%;
    }
    h1{
        margin: .5rem;
        font-size: 2.5rem;
    }
    legend {
        font-size: 2rem;
    }
    fieldset{
        margin: 0;
        margin-left: 1rem;
        min-width: 85%;
        min-height: 18rem;
    }
    label{
        font-size: 1.8rem;
    }
    button {
        background-color: rgba(15, 139, 211, 0.877);
        border-radius: 2rem;
        margin-top: .5rem;
        padding: .6rem;
        text-transform: uppercase;
    }
    input {
        font-size: 2rem;
        padding: .7rem;
        display: block;
        width: 80%;
        background-color: #e1e1e1;
        margin-bottom: .5rem;
        border: none;
        border-radius: .8rem;
    }

}

@media (width:1024px){
    body{
        background-color: rgb(255, 255, 255);
    }
    img {
        max-width: 80%;
    }
    h1{
        margin: .5rem;
        font-size: 3rem;
    }
    legend {
        font-size: 2.5rem;
    }
    fieldset{
        margin: 0;
        margin-left: 1rem;
        min-width: 85%;
        min-height: 18rem;
    }
    button {
        background-color: rgba(15, 139, 211, 0.877);
        border-radius: 2rem;
        margin-top: .5rem;
        padding: 1.3rem;
        text-transform: uppercase;
        font-size: 1.3rem;
    }
    label{
        font-size: 2rem;
    }
    input {
        font-size: 2rem;
        padding: .5rem;
        display: block;
        width: 80%;
        background-color: #e1e1e1;
        margin-bottom: .3rem;
        border: none;
        border-radius: .8rem;
    }

}

@media (max-width:380px){
    body{
        background-color: rgb(241, 241, 241);
    }
    img {
        max-width: 80%;
        height: 14rem;
    }
    h1{
        margin: .5rem;
        font-size: 1rem;
    }
    fieldset{
        margin: 0;
        margin-left: 1rem;
        min-width: 85%;
        min-height: 18rem;
    }
    legend{
        font-size: 1rem;
    }
    button {
        background-color: rgba(15, 139, 211, 0.877);
        border-radius: 1.8rem;
        margin-top: .5rem;
        padding: .6rem;
        text-transform: uppercase;
        margin: 0;
    }
    input {
        font-size: .95rem;
        padding: .7rem;
        display: block;
        width: 80%;
        background-color: #e1e1e1;
        margin-bottom: .5rem;
        border: none;
        border-radius: .8rem;
    }
    .contenido-formulario {
        width: 50%;
    }
    .contenido-resultado{
        width: 50%;
        text-align: center;
        font-size: 1.5rem;
    }
}

@media (width:320px){
    .footer{
        position: relative;
    }
}