style.css

* {
    padding: 0;
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
}

html {
    background: url(./images/17973908.jpg) no-repeat center center fixed;
    background-size: cover;
    height: 100%;
    overflow: hidden;
}
h1 {
    text-align: center;
    padding: 30px;
    margin-top: 20px;
}
.box {
    margin-top: 10px;
    width: 30%;
    min-height: 800px;
    float: right;
    background: rgba(74, 144, 226, 0.35);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border-top-left-radius: 40px;
    border-bottom-left-radius: 40px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    position: relative;
   
}
.box {
    text-align: center;
}
input[type='text'] {
    width: 90%;
    padding: 10px;
}

ul {
    margin: 20px;
    margin-bottom: 10px;
    font-size: 1.5rem;
}
button {
    background-color: black;
    margin-top: 20px;
    padding: 10px;
    background-color: white;
    border-radius: 10px;
} 

button:hover{
   background-color: #03e3fc;
}

li{
    list-style-type:none ;
    font-size: 20px;
    margin-bottom: 10px;
    
}

@media (max-width: 700px) {
    .box{
       float: none;
       margin: auto;
       width: 90%;
       border-radius: 40px;
    }
}