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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #fff;
    color: #555;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: #555;
}

p {
    font-weight: 300;
}

.flexon {
    display: flex;
    flex-direction: column;
    text-align: center;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.flexon input {
    display: block;
    padding: 15px 5px;
    margin: 20px;
    min-width: 300px;
    border: none;
    border-bottom: 1px solid #b9b9b9;
    font-size: 18px;
    font-weight: 400;
    outline: none;
    transition: border-bottom 0.2s;
}

.flexon input:focus {
    border-bottom: 2px solid #333;
}

.flexon input:focus::placeholder {
    color: transparent;
}

.flexon .btn {
    background-color: #48d548;
    padding: 12px 5px;
    border-width: 0;
    color: #fff;
}

.flexon .btn:hover {
    opacity: 0.7;
}

.flexon .btn:focus {
    border-bottom: none;
}

p a {
    font-weight: 500;
}

p a:hover {
    color: tomato;
    text-decoration: underline;
}