index.css

:root{
    --VeryDarkBlue: hsl(243, 87%, 12%);
    --DesaturatedBlue: hsl(238, 22%, 44%);
    --BrightBlue: hsl(224, 93%, 58%);
    --ModerateCyan: hsl(170, 45%, 43%);
    --LightGrayishBlue: hsl(240, 75%, 98.5%);
    --LightGray: hsl(0, 0%, 75%);
}
* {
    margin: 0;
    padding: 0;
}
img,
button{
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}
.displayNone{
    display: none;
}
.first-error,
.second-error{
    color: #e93f3c;
}
body{
    display: flex;
    flex-direction: column;
    font-size: 16px;
    font-family: 'Open Sans', sans-serif;
    font-weight: 400;
    color: var(--VeryDarkBlue);
}
nav{
    font-family: 'Raleway', sans-serif;
    font-weight: 400;
}
h3{
    font-family: 'Raleway', sans-serif;
    
    font-weight: 700;
    font-size: 40px;
}
nav{
    position: sticky;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    height: auto;
    padding: 5vh;
}
nav > div > img{
    content: url("./images/logo.svg");
}
ul li{
    display: inline;
    list-style-type: none;
}
ul li:nth-child(1),
ul li:nth-child(2){
    margin-right: 2vw;
}
nav,
header,
.content{
    padding: 5vh 6vh 12.5vh 6vh;
}
.call-to-action,
footer{
    padding: 7vh 6vh 7vh 6vh;
}
header,
.content,
.call-to-action{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: row;
}
header > div,
.content > div,
.call-to-action > div{
    width: 50%;
    height: auto;
}
header > div > *,
.content > div > *,
.call-to-action > div > *,
footer > div > div > *,
footer > div > img {
    margin: 2vh;
}
header > div > img,
.content > div > img{
    width: 100% !important;
    max-width: 600px;
} 
header > div > img{
    content: url("./images/illustration-1.svg");
    object-fit: cover;
}
header > div > form,
.call-to-action > div > form{
    display: flex;
    flex-wrap: wrap;
}
.container-a{
    border-bottom: 1px solid var(--ModerateCyan);
    width: fit-content;
    position: relative;
    display: flex;
    flex-direction: row;
    color: var(--ModerateCyan);
    padding-bottom: 5px;
    align-items: end;
}
.content > div > div > a{
    text-decoration: none;
}
.content > div > .container-a:hover{
    cursor: pointer;
    color: #7edece !important;
    border-color: #7edece !important;
}
.content > div > .review{
    margin-top: 4vh;
    padding: 2vh;
    border-radius: 5px;
    box-shadow: 0px 0px 31px 16px rgba(191,191,191,0.4);
    -webkit-box-shadow: 0px 0px 31px 16px rgba(191,191,191,0.4);
    -moz-box-shadow: 0px 0px 31px 16px rgba(191,191,191,0.4);
}
@media (min-width: 1001px){
    .review{
        max-width: 400px;
    }
}
.content > div > .review > .virgolette{
    content: url("./images/icon-quotes.svg");
}
.flex-testimonial{
    margin-top: 2vh;
    display: flex;
    flex-wrap: wrap;
    justify-content:end;
    align-items: center;
}
.container-img{
    flex: 50%;
    max-width: 6vh;
}
.container-description{
    flex: 50%;
}
.content > div > .review > div > div > .foto-profilo{
    content: url("./images/avatar-testimonial.jpg");
    border-radius: 100px;
    max-width: 5vh;
}
form{
    margin: 2vh 2vh 2vh 2vh !important;
}
footer{
    background-color: var(--VeryDarkBlue);
}
footer > div:last-child{
    display: flex;
    flex-wrap: wrap;
    color: white;
}
footer > div > div{
    flex: 25%;
}
@media (min-width: 1250px){
    .email{
        margin-right: 20px;
    }
    .email{
        min-width: 300px;
        max-width: 400px;
    }
    .submit{
        max-width: 200px;
    }
}
.email,
.submit{
    height: 40px;
    flex: 50%;
}
.email{
    padding-left: 10px;
    border: 1px solid var(--VeryDarkBlue);
}
.email2{
    border: 1px solid var(--DesaturatedBlue);
}
.submit{
    height: 42px;
    background-color: var(--BrightBlue);
    border: none;
    color: var(--LightGrayishBlue);
    font-weight: 700;
}
.submit:hover{
    cursor: pointer;
}
input{
    border-radius: 3px;
}
.email::placeholder{
    color: var(--LightGray);
}
.submit:active{
    background-color: #6b9bff;
}
.email2,
.second-error{
    margin-bottom: 2vh;
    width: 100% !important;
}
@media (min-width: 1001px){
    form:last-child{
        padding-left: 14vw;
        margin-top: 6vh;
    }
}
.submit2{
    width: 100% !important;
}
@media (max-width: 1268px){
    .email{
        margin-bottom: 2vh;
    }
}
@media (max-width: 1250px){
    .email2{
        min-width: none !important;
    }
}
.content > div > img{
    content: url("./images/illustration-2.svg");
}
header > div:last-child,
.content > div:last-child{
    text-align: center;
}
.curve{
    content: url("./images/bg-curve-desktop.svg");
}
.content{
    background-color: var(--LightGrayishBlue);
}
.call-to-action{
    color: var(--LightGrayishBlue);
    background-color: var(--DesaturatedBlue);
}
footer > div:first{
    margin-bottom: 0px;
}
.li{
    display: flex;
    flex-direction: row;
    align-items: center;
}
.li > *:first-child{
    margin-right: 10px;
}
.social{
    border: 1px solid white;
    padding: 4px;
    margin-left: 0px !important;
    border-radius: 100px;
}
@media (max-width: 1000px){
    nav > div > img{
        max-width: 30vw;
    }
    h3{
        font-size: 34px;
    }
    nav{
        padding: 1vh;
    }
    header,
    .content,
    .call-to-action,
    footer{
        padding: 2vh;
    }
    header,
    .content{
        flex-direction: column-reverse;
    }
    .call-to-action,
    footer{
        flex-direction: column;
    }
    header > div,
    .content > div,
    .call-to-action > div,
    footer > div > div{
        flex: 100%;
        width: 100%;
    }
    form{
        margin: auto !important;
    }
    .content > div > .review{
        margin: 4vh auto 2vh auto !important;
    }
    header > div > *,
    .call-to-action > div > *,
    footer > div > div:last-child{
        text-align: center;
    }
    .content > div > h3,
    .content > div > a{
        text-align: center;
    }
    .container-a{
        margin-left: auto !important;
        margin-right: auto !important;
    }
    header > div > form,
    .review,
    .call-to-action > div > form{
        margin: auto;
        max-width: 400px;
    }
    .review,
    .call-to-action > div > form{
        margin: 0.5vh auto 2vh auto !important;
    }
    header > div > img,
    .content > div > img{
        width: 100%;
        margin: 0;
        max-width: 550px;
    }
    .curve{
        content: url("./images/bg-curve-mobile.svg");
    }
    .call-to-action > div > form{
        max-width: 300px !important;
    }
    footer > div > div{
        margin: 1vh auto 1vh auto;
    }
}