*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}


html, body{
    height: 100%;
}


.box-titulo{
    margin: 40px 3% 0 3%;
}

h1.titulo{
    font-size: 48px;
    border-bottom: 2px solid red;
}

.box-wrapper{
    display: flex;
    flex-wrap: wrap;
}
                        
.box{
    width: calc(100% / 3 - 60px);
    height: 460px;
    background-color: #f1f1f1;
    margin: 40px auto;
    box-shadow: 4px 4px 15px gray;
}
                        
.box form{
    margin: 10px 30px;
}

.box form h1, h2{
    margin: 20px 0;
}

.box form input[type="text"]{
    width: 100%;
    margin-bottom: 10px;
    outline: 0;
    height: 23px;
}
                        
textarea{
    width: 100%;
    height: 110px;
    margin-bottom: 10px;
    outline: 0;
    resize: none;
    padding: 2%;
    line-height: 17px;
    font-size: 16px;
}
                        
.box form input[type="submit"]{
    width: 50%;
    height: 40px;
    background-color: red;
    outline: 0;
    color: white;
    margin-top: 15px;
    font-size: 18px;
}

.flex-box{
    display: flex;
    flex-direction: column;
    align-items: center;
}