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

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-family: "Montserrat", sans-serif;
    background-image: linear-gradient(315deg, #045de9 0%, #09c6f9 74%);
}

.wrapper {
    width: 440px;
    background-color: #fff;
    box-shadow: 0 0 10px #000;
}

form {
    padding: 20px;
    font-size: 20px;
}

h1 {
    margin-bottom: 30px;
    text-align: center;
}

.form-box {
    margin-bottom: 15px;
}

.form-box label {
    display: inline-block;
    margin-bottom: 5px;
}

.form-box input {
    width: 100%;
    padding: 10px;
    font-size: 16px;
    border: 1px solid rgb(197, 197, 197);
    border-radius: 5px;
}

.form-box.error input {
    border: 1px solid rgb(0, 137, 250);
    background-color: rgba(0, 137, 250, 0.1);
}

.error-text {
    margin: 5px 0 0 10px;
    font-size: 14px;
    color: rgb(0, 137, 250);
    visibility: hidden;
}

.form-box.error .error-text {
    visibility: visible;
}

.control-buttons {
    display: flex;
    justify-content: flex-end;
}

.send,
.clear,
.close {
    display: block;
    padding: 10px 0;
    margin-left: 10px;
    width: 100px;
    font-size: 18px;
    background-color: rgb(0, 140, 255);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.send:hover,
.clear:hover,
.close:hover {
    background-color: rgb(0, 107, 194);
}

.popup {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    position: absolute;
    top: -300px;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 200px;
    background-color: #fff;
    border-radius: 8px;
    border: 2px solid black;
    transition: top .5s;
}

.popup p {
    font-size: 28px;
}

.popup .close {
    margin-top: 20px;
}

.show-popup {
    top: 150px;
}