gitea/public/less/_install.less

.install {
    padding-top: 45px;

    form {
        @input-padding: 320px !important;

        label {
            text-align: right;
            width: @input-padding;
        }

        input {
            width: 35% !important;
        }

        .field {
            text-align: left;

            .help {
                margin-left: @input-padding+15px;
            }

            &.optional .title {
                margin-left: 38%;
            }
        }
    }

    .ui {
        .checkbox {
            margin-left: 40% !important;

            label {
                width: auto !important;
            }
        }
    }
}