style.css

* {
    padding:0;
    margin:0;
    font-family: system-ui;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

header {
    padding: 1rem;
    font-weight: 500;
    font-size: 1.2rem;
    color: #673AB7;
    box-shadow: 0px 0px 8px 0px #0000005c;
    margin-bottom: 2rem;
    width: -webkit-fill-available;
}

.main {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 18rem;
    height: 23rem;
    box-shadow: 0px 0px 8px 0px #0000005c;
    border-radius: 10px;
    margin-top: 2rem;
}

.main input {
    border: none;
    border-bottom: 2px solid gray;
    margin-bottom: 1rem;
    outline: none;
    font-size: 1.2rem;
    text-align: center;
}

.main button {
    border: 1px solid #673AB7;
    padding: 0.5rem 1rem;
    margin-top: 1rem;
    border-radius: 10px;
    color: #673AB7;
    font-size: 1.1rem;
    background-color: transparent;
    transition: all 0.3s ease;
    cursor: pointer;
    outline: none;
}

.main button:hover{
    box-shadow: 0px 2px 7px 0px #0000005c;
}

#placeHolder img {
    border: 1px solid #3F51B5;
    border-radius: 10px;
    margin-bottom: 2rem;
}