style.css

@import url('https://fonts.googleapis.com/css2?family=Lato:wght@300&family=Ubuntu:wght@300&display=swap');

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

:root {
    --my-font: 'Ubuntu', sans-serif;
    --lg-color: linear-gradient(to left, #74ebd5, #9face6);
    --light-color: linear-gradient(to right, rgb(76, 216, 190), rgba(131, 185, 231, 0.7));

}

body {
    background-image: var(--light-color) ;
    background-size: 100%;
    background-repeat: no-repeat;
    font-family: var(--my-font);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    width: 100vw;
}

.container {
    background-color: #fff;
    box-shadow: 0 2.8px 2.2px rgba(0, 0, 0, 0.034), 0 6.7px 5.3px rgba(0, 0, 0.048);
    overflow: hidden;
    -webkit-border-radius: 10px;
    width: calc(100vw-65vw);
    max-width: 100%;
    border-radius: 10px;

}

.bi{
    font-size: 1.3rem;
    margin: 6px;
}

.form {

    padding: 40px;
}

.form-control {
    margin-bottom: 20px;
    padding: 10px;
    position: relative;
}

.form-control label {
    display: inline-table;
    margin-bottom: 5px;
}

.form-control input {
    width: 100%;
    border: 2px solid #f0f0f0;
    border-radius: 5px;
    display: inline-block;
    padding: 12px;
}

.form-control input:focus {
    outline: 0;
    border-color: #777;
}

.form-control.success input {
    border-color: #06612c;
}

.form-control.error input {
    border-color: #e74c3c;
}

.form-control i {
    position: absolute;
    right: 12px;
    top: 38px;
    visibility: hidden;
}

.form-control.success i.bi-check-circle-fill {
    color: #06612c;
    visibility: visible;
}

.form-control.error i.bi-exclamation-circle-fill {
    color: #e74c3c;
    visibility: visible;
}

.form-control small {
    visibility: hidden;
    position: absolute;
   margin-bottom: 30px;
    left: 0;
    color: rgb(243, 92, 117);
}

.form-control.error small{
    visibility: visible;
    margin-top: 48px;
    margin-left: 15px;
}

.header {
    background-image: var(--lg-color);
    padding: 15px;

}

.header h1 {
    color: #222;
    text-transform: uppercase;
    text-align: center;
    font-size: 25px;
}

.form .btn {
    background: var(--lg-color);
    border-radius: none;
    outline: none;
    display: block;
    font: 15px;
    padding: 15px;
    margin-top: 20px;
    width: 100%;
    font-weight: bold;
    text-transform: uppercase;
    transition: all 1s ease;

}

.form .btn:hover {
    background: linear-gradient(to right, #74ebd5, #9face6);
}

@media(max-width:998px){
    .container
    {
        width: calc(100vw-35vw);
        max-width: 100%;
    }
}