*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body{
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
header{
    width: 100%;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}
video{
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: -1;
}
.card{
    color: rgb(0, 0, 0);
    background-color: #F7DC6F ;
    min-width: 500px;
    min-height: 500px;
    border-radius: 15px;
}
.card h3{
    padding: 30px;
    font-size: 2rem;
    text-align: center;
    margin-bottom: 30px;
    font-weight: bold;
}
.form-group{
    font-size: 20px;
    margin: 20px;
}
.form-group input{
    display: block;
    width: 90%;
    padding: 10px 0;
    margin-top: 10px;
    background-color: transparent;
    border: 0;
    color: #fff;
    height: 30px;
    font-size: 20px;
    box-shadow: 0 1px 0 0 #fff;
    transition: all .5s linear;
}
.form-group input:focus,
.form-group input:valid{
    outline: none;
    height: 60px;
}
.card .btn{
    display: block;
    margin: 40px auto;
    text-align: center;
    background-color: #90d441;
    color: rgb(0, 0, 0);
    padding: 10px 30px;
    border: none;
    cursor: pointer;
    border-radius: 5px;
    font-size: 20px
}
.card .btn:focus{
    outline: none;
}
.card .btn:hover{
    background-color: #e9e9e9;
}
.card .btn:active {
    position: relative;
    top: 2px;
}
.card a{
    text-decoration: none;
    color: #fff;
    display: block;
    text-align: center;
    font-size: 18px;
    padding: 10px;
}
.card a:hover{
    text-decoration: underline;
}