*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    font-family: Arial, Helvetica, sans-serif;
}
video{
   width: 100%;
   min-height: 100%;
   position: absolute;
   object-fit: cover;
  z-index: -1;
  filter: brightness(.3);
}

.box{
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    width: 450px;
}
h1{
    font-size: 35px;
    margin: 20px 10px;
    color: rgb(0, 0, 0);
}
input{
    font-size: 25px;
    padding: 8px;
   width: 95%;
   height: 70px;
   background-color: rgba(68, 93, 175, 0.473);
   color: black;
   border: none;
   border-radius: 10px;
   font-weight: 600;
}
input:focus{
    outline: none;
}
input::placeholder{
    color: rgb(37, 37, 37);
    font-weight: 400;
    font-size: 20px;
}
img{
    width: 230px;
}
h3{
    font-size: 20px;
    margin-bottom: 10px;
    color: red;
}
button{
    font-size: 23px;
    padding: 10px;
    width: 90%;
    background-color: rgba(0, 0, 255, 0.747);
    border: none;
    border-radius: 5px;
    font-weight: 700;
    color: white;
    cursor: pointer;
}
button:active{
    scale: .9;
}

@media screen and (max-width: 560px) {
    .box{
        width: 90%;
    }
    h1{
        font-size: 25px;
    }
    h3{
        font-size: 15px;
    }
}