:root{
    --colorTextos: #49454567;
}

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

body {
    background: #fff;
    font-family: 'Jost', sans-serif;
    width: 100%;
    height: auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

form{
    margin-top: 10px;
    background: rgba(255, 255, 255, 1);
    width: 90%;
    padding: 10px 0;
    border-radius: 10px;
    box-shadow: 0 0 6px 0 rgba(199, 199, 199, 0.5);
}

.form{
    width: 100%;
    margin: auto;
}

form .grupo{
    position: relative;
    margin: 25px;
}

input, textarea{
    background: none;
    color:#c6c6c6;
    font-size: 18px;
    padding: 10px 10px 10px 5px; 
    display: block;
    width: 100%;
    border:none;
    border-bottom: 1px solid var(--colorTextos);
    resize: none;
}

input:focus,textarea:focus{
    outline: none;
    color: rgb(94,93,93);
}

input:focus~label, 
input:valid~label, 
textarea:focus~label, textarea:valid~label{
    position: absolute;
    top: -14px;
    font-size: 12px;
    color: rgba(1,156,71,1);
}

label{
    color: var(--colorTextos);
    font-size: 16px;
    position: absolute;
    left: 5px;
    top: 10px;
    transition: 0.5s ease all;
    pointer-events: none;
}

input:focus~.barra::before, textarea:focus~.barra::before{
    width: 100%;
}

.barra{
    position: relative;
    display: block;
    width: 100%;
}

.barra::before{
    content: '';
    height: 2px;
    width: 0%;
    bottom: 0;
    position: absolute;
    background: linear-gradient(to right, #00BA00, #004100);
    transition: 0.3s ease all;
    left: 0%;
}

button{
    background: rgba(1,146,70,1);
    display: block;
    width: 100px;
    height: 40px;
    border: none;
    color: #fff; 
    border-radius: 4px;
    font-size: 16px;
    margin: 10px auto;
    cursor: pointer;
}

button:hover {
    background: #00C440;
    transition: all 300ms;
}

@media screen and (max-width:1100px){
    form{
        width: 75%;
    }
}

@media screen and (max-width:600px){
    form{
        width: 85%;
    }
}

@media screen and (max-width:450px){
    form{
        width: 90%;
    }
}

@media screen and (max-width:300px){
    form{
        width: 95%;
    }
}