index.css

body {
    margin: 0;
    padding: 0;
    background: #fff;
}

nav {
    display: flex;
    flex-direction: row;
    justify-content: end;
    align-items: flex-end;
    justify-content: flex-end;
    margin: 15px 15px;
}

#sign_in {
    color: black;
    background: #8ab4f8;
    padding: 8px 22px;
    margin-bottom: 10px;
    border: 2px solid #fff;
    border-radius: 4px;
    font-size: 15px;
}

#sign_in:hover {
    cursor: pointer;
    background: #fff;
    border: 2px solid black;
    color: black;
}

.main {
    position: absolute;
    top: 70%;
    left: 50%;
    transform: translate(-50%, -100%);
}

.google {
    position: relative;
    width: 380px;
    top: 80px;
}

.searchb {
    margin-top: 80px;
    width: 140%;
    height: 45px;
    position: absolute;
    transform: translate(-20%, 50%);
}

input[type="text"] {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    border-radius: 50px;
    border: 1px solid #d5d4d4;
    outline: none;
    padding: 0 40px 0 45px;
    font-size: 16px;
    font-family: noto sans hk;
    box-shadow: 0 2px 10px -7px #000;
}

.searchicon {
    top: 13px;
    left: 18px;
    color: #777;
    font-size: 21px;
    z-index: 1;
    position: absolute;
}

.mic {
    position: absolute;
    width: 13px;
    right: -65px;
    top: 13px;
}

.mic:hover {
    cursor: pointer;
}

.sbutton input {
    padding: 5px 10px;
}


#trend {
    color: rgb(47, 45, 45);
    display: flex;
    flex-direction: column;
    margin-top: 100px;
    position: relative;
    top: 100px;
    text-decoration: none;
    cursor: auto;
}

.trend {
    color: rgb(107, 90, 90);
    display: flex;
    flex-direction: column;
    margin-top: 10px;
    margin-left: 13%;
    position: relative;
    top: 100px;
    text-decoration: none;
}

.trend:hover {
    cursor: pointer;
    color: rgb(47, 45, 45);
}

input[type="button"] {
    background: #ebe8e8;
    border: none;
    padding: 8px 20px;
    margin: 10px;
    color: #4e4d4d;
    border-radius: 5px;
    outline: none;
}

input[type="button"]:hover {
    box-shadow: 0 0 2px #000;
    color: #000;
    background: #ede8e8;
}

nav {
    float: right;
    font-family: arial;
    font-size: 13px;
}

.avatar {
    width: 35px;
    border-radius: 50%;
    margin: 10px 20px 0 0;
}

.navtext {
    color: #444;
    text-decoration: none;
    top: -12px;
    position: relative;
    margin: 5px;
    font-size: 15px;
}

.navtext:hover {
    font-size: 14px;
}

.apps {
    position: relative;
    margin: 10px;
    top: -6px;
    color: #555;
    cursor: pointer;
}

/* media queries */
@media screen and (max-width:650px) {
    nav {
        margin-right: -20px;
    }

    .google {
        width: 230px;
    }
}

@media screen and (max-width:300px) {
    .google {
        width: 190px;
    }

    .searchb {
        width: 90%;
    }

    .searchb input {
        font-size: 13px;
    }
}